Malicious PDF — malware analysis report

Static analysis result for SHA-256 673327ffb0f9253b…

MALICIOUS

PDF

84.2 KB Created: 2021-04-17 10:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 02232a077a8c1d6e44862ab6e95846d4 SHA-1: cd6a99727dbce010ab65439e64eba0f3ab3a5c3f SHA-256: 673327ffb0f9253b550b5e7d18db62fffb30791ced385a0e2384764e49bdf90c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing lure, employing a link farm on disposable hosting to direct users to external resources. The heuristic findings indicate a high likelihood of malicious intent, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document's structure and embedded URLs suggest an attempt to trick users into downloading further content, potentially leading to malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=business+law+books+for+mba+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/bitaxukezor/a0ih6gd/beloluw.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/6cp2icO/spotlight_color_changer.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/linaxarokimuvi_dakonowanori_muvad.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/fYe8jQE/togumirufu.pdfIn PDF document text
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/d87ff88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43fd21b-b87b-482d-b14a-4fc640c741d4/94669152183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca188e01-9cd2-4e3c-af13-1495fca7f77c/dometic_rv_thermostat_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca1e778-ff53-41b2-86f5-74542b35ea58/76026351819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc897dd6-3c39-4d1f-8613-3a3bbb2feb21/integral_of_x3_cosx2dx.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_16a97c4550f5401aa69479fca090425c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cb6093-ef45-4085-92a4-2289a1edeab3/47141159727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580c8c86-2e04-4dc9-83b0-6bdd3517eda6/what_document_created_the_three_branches_of_government.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/493cbaf3-76e1-406c-b6fd-85a0ba424d0f/zokufomevoriragadutesulon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df01946f-c3ef-4ee2-b8b0-7d5d2334c8fd/what_are_the_major_components_of_marketing_information_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefc5c13-bc9b-41ef-805d-c79b7899fd0a/how_to_write_your_own_personal_development_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d52598b-e58d-4eef-b304-2596044ca9f8/xavezotan.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_5fcbaf0088374c8cb7fc9bffd3a91e5d.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_6995dfa9f4ca4dcf99276fe0bdbeb6ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc19bddb-8e6c-409c-9256-7ad62c482bb0/15777183685.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_de283faaa12a4473b32aafdf3630bcec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/317890b2-0077-48b3-8f62-f3c984f89ce9/xototekotif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8278957e-2032-4a3b-a203-2dd01609b69b/56931115982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87135982-c91f-4b14-bb55-0e011a8a1e8d/44660542569.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 6832 bytes
SHA-256: bfe39baa656defdf4f8b5cac988ef1f714559f5dddd620217125fb14b328de4e
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 5532 bytes
SHA-256: 987486f981ba52e8ed1faba7e7e83ad2bb84bd7bf08f73ff05f7e4b7344566a7
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 11088 bytes
SHA-256: 94d560f118de14b58d7f41d4692567d7ec16f1fc3ec43f847414b866fcbce4ab