Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85f5005fa3a6af1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 11:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed38294ebad57894d7d97e7ec71a3430 SHA-1: 42c92c89b53e672339046c80a04cda295614a637 SHA-256: a85f5005fa3a6af10e4da5cb7c3869449a0cf58e4716476ae728592f84577f07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, including http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jawopedoluxexa.pdf. The presence of embedded URLs and the link farm nature strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jawopedoluxexa.pdf In PDF document text
    • https://cardolf.ro/files/nowipasejub.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40478245035.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9673749afb3c64b8fd4614613a074a75/zuwarakabetoweduduwizeb.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/34511512151.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/kefowawisibu.pdfIn PDF document text
    • http://actinq.nl/upload/file/wufadatuvabos.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/buralobigu.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/mubetuluxar.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/xoriwisigakowusavoxogi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ebd651af---81547483809.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tojovivomidiluxevoberi.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/18247505294.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/93537387406.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/73299245923.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/5906097656.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/mepejoberubifez.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/40208245564.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/72879125648.pdfIn PDF document text
    • http://underbutter.cz/download/foto/nasiwedox.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/52171598408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pak+chat+rooms+free+onlinePDF 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_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 18220 bytes
SHA-256: 8264199dc02a5c667c85774461a8e8f8c77f8997951af095a3bf1fb7e96c77f3
font_02_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 10692 bytes
SHA-256: 8f8860bfc52177a42cdc4e69f049c4251b771925461b7ea6bfddb42316e6292c

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