Malicious PDF — malware analysis report

Static analysis result for SHA-256 8958c1a97de05264…

MALICIOUS

PDF

78.5 KB Created: 2021-05-08 00:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04d375548ec67af9494a6b3a7fae4416 SHA-1: 8c08fd169e2753f339248a88a6c31918a034a778 SHA-256: 8958c1a97de05264668345254e43d25f0eb1c4abb7ec7740e5090ce2f903e985
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://midufefew.ru/strik?utm_term=races+of+eberron+3.5+pdf PDF link annotation
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/6238549.pdfIn PDF document text
    • http://rajelakitapeki.iblogger.org/figurative_language_worksheets_5th.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_604acecc50d94.pdfIn PDF document text
    • http://natezaka.iblogger.org/vojatutesikepebipema.pdfIn PDF document text
    • http://famavusejozeroj.iblogger.org/wakimizeniduzoruni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_606ae9b3e3774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405430/normal_5fe2bd0f3cf23.pdfIn PDF document text
    • http://motozed.scienceontheweb.net/investigacion_cuantitativa_en_psicologia.pdfIn PDF document text
    • https://pitidupokeni.weebly.com/uploads/1/3/4/4/134485339/xobagatoweguvo-lepigisanodaz-xusimaves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_6046f4f89f5a9.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/4594851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_60390d61571aa.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/eee13b49-0a37-42a6-b7f7-9bfa49eb653e/is_breaking_bad_movie_on_canadian_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d88ee9-6426-4451-8e72-aebfca42e8bf/best_latin_phrases_for_tattoos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60ef161-1d64-457e-b4cb-a1ef5a2cd8c8/zabisogiputazukoribog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca1a0d9-b7cb-4a01-81d4-4c228c954b77/bofifasogig.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/13313412164.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/vimamemixomatarenejogeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21879b70-8476-4143-a355-0bb3d0246a9f/how_to_use_japanese_pocket_warmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f623ce-521c-452c-8645-d950dab5ebde/42328394212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2681b4-25c6-4df9-8805-b6dbd1145c5b/vocabulary_builder_the_constitution_combined_vocabulary_reinforcement_answer_key.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_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 5584 bytes
SHA-256: 37c3a4c52a2a886bc68efed289436cd3ce5383e55546d4fb5d12ac2ee102fc20
font_01_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 10456 bytes
SHA-256: 762acc900af431e72a29da06d57426f27e14b151617a9524a01ff0c695607a29