Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc0addb229a34d7…

MALICIOUS

PDF

77.9 KB Created: 2021-03-07 11:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c6bd52f89a90810b71f1644d756ad4e4 SHA-1: a3e23beb8be796ef102ed551fd76458ec4b01b99 SHA-256: 1dc0addb229a34d7c873723fbe938a8ed91f8c04f96400669a97eb67922c215a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm hosted on disposable domains. One notable URL, 'https://zajinet.ru/strik?utm_term=washington+dc+population+vs+other+states', is flagged as suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=washington+dc+population+vs+other+states PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479441/normal_60261c1c42f3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_6005b9cf3f71e.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/terry_pratchett_wyrd_sisters_movie.pdfIn PDF document text
    • http://dobewobezusisof.iblogger.org/xaziwovopazezodudepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_60218682cb4d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407777/normal_5fce571015fe7.pdfIn PDF document text
    • http://fodagirikazed.iblogger.org/91131530945.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/fjcZXMN/livuja.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/r1lbhd4/83818387198.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://s3.amazonaws.com/dosalapasenow/baidu_root_english_apk_free.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_edebbe60f0fe46cf95dbc39b3e96b2f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/8_ball_pool_games.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/panosuvuduzigiboj.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/gisubikeragajiweparapi.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/freemake_video_er_crack_chomikuj.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/ragulanogixasekurezarum.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_2710dab95ecb4da5bef348c183949b5b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 5288 bytes
SHA-256: 521137dbc7bf0a3650c19abafcb8d62c1dc30475aff2f463d8fa07cf47f2667d
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10656 bytes
SHA-256: a5ffb56f1c1924d439a0bf30dd30b083c3a2aa57ef328d3a8712d05ceb90e600
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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