Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd6610630e91b66…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 04:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4191bf0bb2e5ea0a8f155e5351d15896 SHA-1: 7f07251dc02d24c801ddda332e58e8306d0695e7 SHA-256: 6dd6610630e91b66ac919c1200767f07565519e920b1805d80afa69ec7712659
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://consol.hu/images/uploadedimages/file/lamob.pdf In PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/57793235554.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/16838904132.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/81076970605.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/79729673914.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/39222229933.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/kamuxupimozawufafa.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/23383524732.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/21053865621.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/63792355389.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gojarajibixovamu.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xexaviwolisuvoxideratu.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/gaboxojiwijovodoponu.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/55489621406.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/jepanedodemexowup.pdfIn PDF document text
    • http://metallpress.info/files/weburawasedenewigebajaxev.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/memuwakavufuzikukan.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/50257750755.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613054603f7df---wosaguxobujuvi.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210905160857.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/17455782462.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/35746260993.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/paxozovojixuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=american+horror+story+season+3+episode+1+full+episodePDF 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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 18724 bytes
SHA-256: 0f7aa9b90b5426aa5d905e2846b074a13caa4c83651400d19bab7ff2592142c2
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12866 11304 bytes
SHA-256: 57ec29b68655c44d7b5aea0afb948e9a6b368654cead15b5f43543995ad0fdeb

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