Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfe054da3b1bd5e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-30 22:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e16c9eec8d181e4d324923e5a14fa765 SHA-1: 48c2858a9fa1d8c6d40e8627c0053449aaf2a86d SHA-256: 6bfe054da3b1bd5eaebeeb2cee0b0b62d05487a48592268abd729155769633cf
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to external PDF files. The presence of many distinct hosts and the 'utm_term_redirector' flag suggest a deliberate effort to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/70881600556.pdf In PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24455824988.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/18608290082.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/wamosixur.pdfIn PDF document text
    • https://33mobility.net/uploads/files/89799669284.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/36887413380.pdfIn PDF document text
    • http://jonellchem.com/upload/files/nebulitos.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/55802041972.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/98179436312.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/94905603152.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/zudivavixilivafimufimuk.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210917151932.pdfIn PDF document text
    • http://tyextractor.com/d/files/zevexukuxuvena.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/6144301671.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/23483065834.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/98170773042.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/69453401027.pdfIn PDF document text
    • http://elsped.hu/files/file/63756996962.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/33352130871.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/genelazulisakinenozumuwex.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/70176971161.pdfIn PDF document text
    • https://andrejc.si/files/file/befupezasipoma.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/10732211707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+selection+the+heir+pdfPDF 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://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_off0000ad10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD10 15440 bytes
SHA-256: cc19c3fe4523a60ac404be076b4a4bdd8801bbaab334d75dd26c810edb41cdf9
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 10520 bytes
SHA-256: 5cb9c1961ddf4215b48de45dc8d36ae81004ce85f9bc8eaa08cb50159a32e469
font_02_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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