Malicious PDF — malware analysis report

Static analysis result for SHA-256 933fcecd84653ca3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 08:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6819ef7927a9df6bc554f3024abbb4e2 SHA-1: 0f8da396191a85cc874f39172832b0a408524a2b SHA-256: 933fcecd84653ca324895f71011e63e7fc02134a581c2a2d6272c6674ab02ee4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=real+working+credit+cards PDF link annotation
    • http://klccpa.com/userfiles/file/bopumawixuzugoludo.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/jepezixawuz.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/fadiwiwafenivetivaj.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/matibupafavibanetuz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8393cdbc---12696192790.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/texaxewasowuzawemoked.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210907132504.pdfIn PDF document text
    • http://reichspfarrer.sk/file/buxovimolulav.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/wojami.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/zisutelenaripepilemetiv.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/lobibigumedazowapojepabul.pdfIn PDF document text
    • http://allier-genealogie.org/File:/vitokutop.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/67531547236.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/78908778659.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/zenawe.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/258005107.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/vetatixoninuzod.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/10941225623.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613755ec89554---34101333109.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/99736067465.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/kupadofijemeruniromubo.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/rolivikaserabavoxonixaka.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/8332311915.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_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 17936 bytes
SHA-256: a8e131098ede4b8ee76977253207c177f886a67feed751e0579b4d7a2346a042
font_01_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 10768 bytes
SHA-256: d52962ebade1980f7217484a2cba1b38cfb54d19d8f6d200cd93328141e34c4d

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