Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b220a151fe2278…

MALICIOUS

PDF

74.3 KB Created: 2021-05-05 17:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a7651e2d2bbce5547491f26b21dc6666 SHA-1: eba868d5c5ba3a8e2a9901cb54838ed0611f87e5 SHA-256: 35b220a151fe2278a1e2f8c586acfd7244778235c718851c7584f1f83bdf4620
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=what+do+economics+mean+by+scarcity PDF link annotation
    • http://cheapestshop.xyz/topstore_download_for_android91db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_6045f57c09949.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/egcW4Lh/motu_patlu_colour_changing_camera_episode.pdfIn PDF document text
    • https://cdn.sqhk.co/tevenijubuso/gijiOIg/outbreak_meaning_in_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_60215a432e511.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/how_to_properly_use_a_hair_dryer_diffuserhc3yu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_6057023d55d7f.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/jc51giq/bus_rush_game_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_601582d94ad2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_602a79be985cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_606a10c533b5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_973fa6427193428ca66574796b35c873.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_94d8e5b027554227bb20d116457958b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed51b114-fa2c-451d-bf28-64f61e04452a/ford_e350_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1033d2c5-d014-4f05-ba8a-b813bc2362e5/ascii_table_c_program.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_cc81fc4f9a5147b481a34e3bbad7b3a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1bfe3f-4915-42ff-b67a-320fe0f95d45/zixuxenezawodaxe.pdfIn PDF document text
    • https://1f53f175-067f-4140-b001-f66bebc9855b.filesusr.com/ugd/c711d8_0f6f8ef8414b4ef1b5140dd9c177a8f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5b0e2d-3f14-4269-bd01-f7d140e85580/70751735881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b957ca5a-1b69-444e-81ed-8a333f5f07df/7245867022.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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5400 bytes
SHA-256: 5bd34c8ed52c38af4b4c38e195133652cd41c6753697e11553a0276bbe5f6237
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 10748 bytes
SHA-256: aa1f9a3e8522efa710579d1dd63a929f3b0c067bf44ed74978aef3e5b75588e0