Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff11fcbe8ba6582…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 09:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 61713de7c42f409c2ba5414a6e9bda02 SHA-1: 83232cfbfc4f5a9ff581b52e5001d8f8939345e7 SHA-256: 8ff11fcbe8ba658291af2c42ce4c7db8ebef866144d9f69ea399443a40f8b700
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, a common tactic in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://antoniolescio.net/userfiles/files/22451982247.pdf In PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/fiziwolira.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/novibisopukalojafo.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/52879715256.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/fuwegan.pdfIn PDF document text
    • https://maria-galland.ru/files/file/66157085407.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210908_004909.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/57100640550.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/67093329852.pdfIn PDF document text
    • http://ossokahve.com/upload/file/gurosigeju.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/mimewabeluvadipuvito.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/gozivoval.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/58958337548.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lidagogupew.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/nirazamajem.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/38873193885.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/zozegimomo.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/zozetob.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/93897506221.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vejuwigepofejigopefig.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/jogipe.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100943554890.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/64675111966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=comedy+banane+wala+appPDF 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_off0000ad1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1D 16124 bytes
SHA-256: fd3f8eb43fccdd8f687493ae17c7c9bb78c9dc7320c5994dd060963f73792288
font_01_sfnt_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 10468 bytes
SHA-256: 306b8799bcaefc5c350e43c83a3d5c1911e62bdb3f6f93808e6307b2612ee4bb

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