Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfed971d6b22f2e…

MALICIOUS

PDF

77.7 KB Created: 2021-05-27 22:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09ae2d96c5a307fe9fd977df79f60fa4 SHA-1: 54965eb1db3d6f7f1ef9df8c41c6e24a29a97dfc SHA-256: dcfed971d6b22f2e2d0d72638b1bae5b5aeb0c29493247d0cd38714c7ac48f87
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 0.9991

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://fokemale.ru/123?utm_term=application+for+employment+sample+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426085/normal_6007d18d6db3a.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/vamexesanuverab_jaxaxawirerub.pdfIn PDF document text
    • https://neziraninev.weebly.com/uploads/1/3/4/5/134502601/zopesogomaz.pdfIn PDF document text
    • https://bibunifa.weebly.com/uploads/1/3/4/0/134040356/41355fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_60595fac5a709.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/c55ca38592281fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_6061e6cc97a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6026e108dd5ed.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/dinewuwudaki-maliditiwaj-wepakufopep.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/6f9491271e9f775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_6025b5c48e7a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_6050f92811eb3.pdfIn PDF document text
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/pojirivefaxi-xovoxofe-jikapasufuja-pisidawuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404107/normal_5ff0a59dcda82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_606da717383f9.pdfIn PDF document text
    • https://keminugugenoxag.weebly.com/uploads/1/3/4/3/134321568/zufejozovap-gubami-mixarigomozi-patodimot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_604ca388a470c.pdfIn PDF document text
    • https://bovipapofubamo.weebly.com/uploads/1/3/4/3/134364795/bokozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_6064fb1abccff.pdfIn PDF document text
    • https://zojevobe.weebly.com/uploads/1/3/1/1/131163992/4369499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fce8cff0a0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_602cd84bed054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_5ffe20c77e8bc.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/2cf9b5d0-7461-432c-ac84-bc6625172058/shark_professional_steam_mop_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1db920e-72e8-45ff-8f8f-ee2a55ca6587/74095538708.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_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 5392 bytes
SHA-256: b236aaf1fd14474e05c5030047319677dc70c7ca840037f1f4c47cae4c08d683
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 10352 bytes
SHA-256: a128d39b4c9c5b3500a9ea0f93d588168a6644b8d73e1c315dbaa8b6be195d28