Malicious PDF — malware analysis report

Static analysis result for SHA-256 2135face4dd83ed7…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 17:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 079d0c46f34cd5b3454b80141f305582 SHA-1: 8ef220565f21208c8d0c2b1d70427e555566752e SHA-256: 2135face4dd83ed7569c37cd875f34bb268ce95e939e680f98926f055bdb136e
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 0.9996

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://baarspo.ru/award?keyword=accounting+and+finance+lecture+notes+pdf PDF link annotation
    • https://vimudizod.weebly.com/uploads/1/3/4/6/134632239/movawovil.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/466754.pdfIn PDF document text
    • https://rilavopitokutod.weebly.com/uploads/1/3/4/7/134765049/7267393.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/jamadufab.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/goporo-famakupusiv-mosetanolibuzud.pdfIn PDF document text
    • https://fupejudesomazi.weebly.com/uploads/1/3/4/1/134108974/wozumitol_seradivulipevip.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/tigelome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_5d65e062d9f34280995f04db25b3d4a8.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_11ad85be3d3441948aa42f4819f3ba38.pdf?index=trueIn PDF document text
    • http://niwepikos.rf.gd/79125378501.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_35050ce3fde24af79b6b30633ca97d6a.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_14c3c04dde1d45b9a84339d1fab93ab9.pdf?index=trueIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_3b846b2f93d34a48964faa4816504fcc.pdf?index=trueIn PDF document text
    • http://nadilafirot.rf.gd/76134889619.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_bdf2bfab60c740989084e525be1ced24.pdf?index=trueIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_9786f8eea01b4c6cbf9e410ed228087b.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_c654207ac82b454191e6f61805d8bb21.pdf?index=trueIn PDF document text
    • http://litiwevapebani.epizy.com/gipagatebujes.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_a420b34cacb148119fe90f338613783c.pdf?index=trueIn PDF document text
    • http://nimozan.epizy.com/wuvesogudubewefifemejikes.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_fe1ed8f413b345e8a1cf49d2a77b480d.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_161fbd43e4cc4f2a86e48066c31e3683.pdf?index=trueIn 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_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5312 bytes
SHA-256: 06f8b90320455760b827861d578c3dcafb22f0ade76c1d3f64d8aa80c6a91707
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 11232 bytes
SHA-256: 68ea3e7c89dcc87dbb451ff99c4320c344af54304a0b4e7cb8e199f2026e69dd