Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1a2285b41e33ff…

MALICIOUS

PDF

96.0 KB Created: 2021-09-13 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 977447280a65f0bfa2bdccc455198703 SHA-1: 5d579fb6d80e59cbb2d377fc1cc07dda26f388d1 SHA-256: 8a1a2285b41e33fffad2dd4e769bcbf948b7f765f8aa143eb48be279794a7a33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, suggesting a redirection mechanism to external malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a likely attempt to obscure the true destination or distribute content across multiple disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://philabc.ru/uplcv?utm_term=old+action+movies+bollywood PDF link annotation
    • http://baigeleather.com/userfiles/file/51674192808.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/xorikusoro.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/6789231688.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc8a2d6361---30621538630.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210912035216.pdfIn PDF document text
    • http://kustari.net/userfiles/file/59022144407.pdfIn PDF document text
    • http://mosjob.ru/images/file/podetuzunogeditup.pdfIn PDF document text
    • http://jfe.hk/userfiles/96753528295.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/64188314746.pdfIn PDF document text
    • https://agros.net/uploads/file/62663246936.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/zofidaguvisubibedugewit.pdfIn PDF document text
    • https://lordoptika.hu/files/files/6180689452.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/bajemopedofavu.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/juxeradufiregosub.pdfIn PDF document text
    • http://runo34.ru/attachments/file/28034356170.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/85175008754.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/bajonusezulinikubanebode.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/58478090589.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/89432792620.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/jadulunago.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/35821303340.pdfIn PDF document text
    • http://agrion.org/upload/fichier/nafevug.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kivuxav.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3affc58a301ecd37bf00832cfc556005/fopakelimasejozasop.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/88339192752.pdfIn PDF document text
    • https://j26clean.com/upload/files/72894871025.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://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_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 10864 bytes
SHA-256: 0dd17ecf0df9db365ee860686e3954c59a242f6e394a3b0e0837ccf8f1851e10
font_01_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 17536 bytes
SHA-256: 49ce5b40721a28f9bb3a607088a7064482392aa64de5d20ca5be66f6d6d1eb17
font_02_sfnt_off00015a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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