Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e08d88a08574267…

MALICIOUS

PDF

87.7 KB Created: 2021-03-14 01:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7b5ff139a53fc97848d4c3298b337ef5 SHA-1: 9d6fd3314073150157b3a0a2e546a925bd204658 SHA-256: 0e08d88a08574267ceb4c57c563de7535bbd01c7ed214ad49cded3719f324694
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://nipisod.ru/123?utm_term=how+ru+doing+answer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fd2745fc24d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5fdc238c37d4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5fde9d967e5f3.pdfIn PDF document text
    • http://gtomishebs.xyz/913591682853q8qh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383795/normal_60049083b1263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_600ed977b6345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479905/normal_602b976db90e1.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/HidHEjf/pamonivaridixob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445737/normal_5ff1f03cbd373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fd2f20bf294e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_6011f26f13113.pdfIn PDF document text
    • http://faceit.su/5431383091ox1o0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402504/normal_5feb0c4512267.pdfIn PDF document text
    • http://vir-tus.com/karerujunozawuwisatowovoz7oof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fd8dceb129d7.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/eXhjN7r/rikulor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_602f40d1a2ee8.pdfIn PDF document text
    • http://remontnatali.ru/i_took_the_road_less_traveled_quotecozg8.pdfIn PDF document text
    • http://ch-redirect.icu/rifajolomulasizasufideuje1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_6041b184e6864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fe93a5508e86.pdfIn PDF document text
    • https://cdn.sqhk.co/liramesot/Rj5getB/not_a_one_way_street_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 5016 bytes
SHA-256: 9db4bf003ed1e544b769aa9fa09d3180b022216824c62002e4bdf9b47e645e5e
font_01_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 11172 bytes
SHA-256: 443831f029e595de60830b97c2429b4101dfa5443cf4e8d5f573ceec8a5ddc3a

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