Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af04c65843f999f…

MALICIOUS

PDF

82.9 KB Created: 2021-05-31 05:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0ad5c3a491d7178f00ca8404ccc21bb3 SHA-1: aabea909e1f102169a0b60746311941ec4dc07de SHA-256: 1af04c65843f999fac79236f953f3cd9b8688a94b719f434ae359bf9b2bf5927
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=spatial+reasoning+test+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414357/normal_6021c399244d5.pdfIn PDF document text
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/niwokaf.pdfIn PDF document text
    • https://donadoleli.weebly.com/uploads/1/3/4/5/134519335/wujolur.pdfIn PDF document text
    • https://pubogovivewata.weebly.com/uploads/1/3/2/3/132302724/5672909.pdfIn PDF document text
    • https://zexosupalagal.weebly.com/uploads/1/3/4/8/134887224/b4be79427c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421767/normal_6006aae7dd14f.pdfIn PDF document text
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/sozusixewiti-guzipotokuke-fupotu-mimuwetobejis.pdfIn PDF document text
    • https://gavabedaxi.weebly.com/uploads/1/3/4/9/134902957/79a2ef68a2907cc.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/lapojamap.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/turaxexebito.pdfIn PDF document text
    • https://lugivizukur.weebly.com/uploads/1/3/1/8/131871894/liser.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/749633.pdfIn PDF document text
    • https://woxawilafuzuve.weebly.com/uploads/1/3/4/6/134669094/sumamug.pdfIn PDF document text
    • https://wirolubu.weebly.com/uploads/1/3/1/4/131453990/1d73140fe786.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fc72a1445ac5.pdfIn PDF document text
    • https://nowezafe.weebly.com/uploads/1/3/4/6/134616333/zagipuloba-nitem-jifemug.pdfIn PDF document text
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/puxomedexixowogez.pdfIn PDF document text
    • https://nomikumeparibop.weebly.com/uploads/1/3/4/6/134638052/bodizafis-vitovi-rupuxerafulejaz-bifituwasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_600d508337d17.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/6706485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3787ef48-7a45-4bf6-856e-2510188d1ba2/business_communication_class_projects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c6271e-a880-408a-8759-3920225bd673/how_to_actively_listen_to_your_partner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb77e33a-0d96-440a-bd40-64c985697bf6/baby_grinch_actor_dead.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 5064 bytes
SHA-256: 8eacf162064be411c9ba636d20177ed8f8a77bea332cbfabf7662c2055ae9883
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10748 bytes
SHA-256: 159d610be706c106b19ffe384191c44e7fe527b98a1909ca33ccf706fbb792bb
font_02_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2