Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3b66b0947be407…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 00:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: efacfa762d558cb3fdbc701b6ecbb0c8 SHA-1: d1ab6377f778cca7b03e87eb4849ad97202cc7e0 SHA-256: 8b3b66b0947be4075cf1473e9b6a628400703d0ad870da3e44e5d842c63b7f51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for SEO manipulation or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sapporomn.com/userfiles/files/53411306449.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-20/20210920010705629252.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/puzovivupixojalisefekap.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5dad674876179c660e45d4a0c462c13e/nasuvinikapifawiped.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/zowejuxelalodorazejive.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/roredumowivo.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/tezuj.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/5783901907.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109030441317600.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dekiket.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/50812651290.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/zafana.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/40094475102.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/46365398391.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/matokotisufa.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/jetojuxinobakixigixi.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/49971362558.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/rufudewolofuzuwun.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/rurasitabetezakupefodip.pdfIn PDF document text
    • http://bulmarconsult.com/files/3011737173.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/vesonelirib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pc+games+32+bit+windows+7PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 11136 bytes
SHA-256: bb4a76339e98a3752f0829c23585bda366b764b2667017e1d99c2cdedfd695cc
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 15076 bytes
SHA-256: 2d244b835ccab82d0406d1be9127f7b1f2ba21766828e286628d4a5159d63ad4
font_02_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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