Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0ec9af3dec4d2f…

MALICIOUS

PDF

76.7 KB Created: 2021-04-06 08:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d145e58442d20882ba4d3c74acd96079 SHA-1: f25bad693c6375869c4080d8ccf57d48694d9783 SHA-256: cb0ec9af3dec4d2fd76e9a4bb273b554778a619574d570b095a60d60508ddca9
74 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'SE_INVOICE_LURE' suggests a deceptive content strategy, and the presence of external URIs like 'https://mezovuduw.ru/strik' indicates an attempt to redirect the user to potentially harmful content. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mezovuduw.ru/strik?utm_term=how+to+get+a+copy+of+my+pals+card PDF link annotation
    • http://instapriz.site/manaroxetivutupu15tyf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_60194b78971a3.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/Ighiagd/where_can_i_buy_digestive_biscuits_near_me.pdfIn PDF document text
    • http://usejus.club/1420110469756cna.pdfIn PDF document text
    • http://xazonojader.mywebcommunity.org/wusikelijib.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/95370477143.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/EhhGa8t/playerpro_music_player_5._0_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fdeeca2d7988.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/hcjaiaf/wuxipakakekatizigipipotos.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/fhdN2hj/losalujemapatumuzamemiti.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/qjbhdTe/redbubble_drink_more_water.pdfIn PDF document text
    • http://apsmall.space/tefimik0wdip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_604fa3d809c85.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/2Hgj2gc/61151470290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5ff3a172c5395.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/98320804-ae66-4b7b-a0a9-c165272b504e/writing_a_scientific_research_paper_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66a3db8-8f24-4168-9f11-93d8d767a865/karcher_k4_full_control_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73731cc-6375-46ab-afbf-3e4ddb0044a5/scary_stories_to_tell_in_the_dark_all_artwork.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c978bea1-6a24-4aa7-b06b-fd1b0a67a2ad/38624222793.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/bezofog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa937e8-8b6f-4213-afe3-4ddc79d6085b/77092727367.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 5632 bytes
SHA-256: 794899e24c4f4e2c1b93d38c74d03f63fcd11f0a9c024caf1ff708b0ccea1189
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 11604 bytes
SHA-256: 934482757a4846fb007708c5934cdd2517ea0c889e9518e780beb83459d0740f

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