Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafebc245c6b2375…

MALICIOUS

PDF

75.4 KB Created: 2021-06-07 23:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5f7c9d620ae7b5641fee190ced869a4b SHA-1: b1f80aa358a44521ebebc105a9cf7d593e319ede SHA-256: bafebc245c6b237587923e806673427d145b51acb11a44468453cc24f0e1f457
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 0.9993

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://maypoin.ru/123?utm_term=born+free+full+movie PDF link annotation
    • https://zegemukugemilut.weebly.com/uploads/1/3/4/7/134707242/zojonikisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_60214eccaee05.pdfIn PDF document text
    • https://kizuwapeputatu.weebly.com/uploads/1/3/4/3/134375201/6a7a350fe8d88.pdfIn PDF document text
    • https://dufowazana.weebly.com/uploads/1/3/4/5/134529111/5f88da3e56999.pdfIn PDF document text
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/96fa853a06809.pdfIn PDF document text
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/7c7530374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_6038d3f168cc1.pdfIn PDF document text
    • https://xidusogosogi.weebly.com/uploads/1/3/4/3/134313600/gikasoje.pdfIn PDF document text
    • https://lerofiputa.weebly.com/uploads/1/3/4/3/134367001/ditinajekora.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/warosefuzimos-tikutazemomuxa-kiwazi.pdfIn PDF document text
    • https://dukiferuxol.weebly.com/uploads/1/3/0/8/130873869/6143361.pdfIn PDF document text
    • https://pobowapikojuga.weebly.com/uploads/1/3/4/9/134903403/7cd11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_605a9f791e234.pdfIn PDF document text
    • https://vunabiripiboxuw.weebly.com/uploads/1/3/4/7/134756527/c9ef42ec98f3bb1.pdfIn PDF document text
    • https://wudufedowuton.weebly.com/uploads/1/3/2/8/132815791/jizifezi.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/639cb3de-a438-4008-98db-38176e6ae73c/jadupidasefipomulel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237b3ab6-95cf-4702-a40b-feb9645a63b9/86615555432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3ecdde-1f66-470a-ba40-8afe9c118a18/safobaxunebinefusilajupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e309ba-d4c7-41d3-a1ae-4436b4d4026c/maus_my_father_bleeds_history_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f730c0-2e01-418b-b9d9-2fe2f3c2d087/26493738114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62dbf8cf-80dd-40bf-b8a3-89d9e70028c2/paginizubawosawatatulurup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59de055-e6d1-4916-b0b3-59d609dc441f/47329165530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51a293d-cfde-463d-b9ce-99b784932c79/how_do_you_explain_prepositional_phrases.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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 4632 bytes
SHA-256: 379279ec87feb5109e8fc90e55febc381b7bbbb6eeb8da12bb437e002bd6f777
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 10944 bytes
SHA-256: 65f3766cf5365b409f249e44c4f5d50054e1bc168fad1c7713e9e2fc7e505ed3