Malicious PDF — malware analysis report

Static analysis result for SHA-256 06549e6971b1be31…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 12:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 796fa84dda5207685bcb5bbcb355a723 SHA-1: b48d17ce2ec8975ffe3030cb1e9476202839b871 SHA-256: 06549e6971b1be31cc919ef7eef6d4608e3291f44d20b5ff7586e53dd4ca3a14
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically calls out this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://files.ibiza-ferien.de/file/42740347525.pdf In PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/lufobazaxotenibixilizu.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/lilewagavupelul.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/28605472740.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/5382015347.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/supule.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/62375937532.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/25958871308.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/76411288135.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/45684699856.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/farodasobilozigalive.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/53483192012.pdfIn PDF document text
    • http://ore-processing.ru/d/files/457038431.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/numag.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/73139264993.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/supifek.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/moduzelanapinuveji.pdfIn PDF document text
    • http://retailcop.ca/files/miwumevalexinidakozokafe.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/83651288721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=star+wars+revenge+of+the+sith+novelization+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://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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 17996 bytes
SHA-256: f1613dcbd992028d1347023d1ba079f85b0cc7a8eea46d46ca578c098f1bcc7e
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 11064 bytes
SHA-256: 1b9d76afbaeb660749d1189363e0340af5128f3a4a78a511fc02c073827e7a22

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