Malicious PDF — malware analysis report

Static analysis result for SHA-256 685febdbe8128840…

MALICIOUS

PDF

68.0 KB Created: 2021-10-03 04:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 687393a6daf43512615bee151f039282 SHA-1: cf39380e0f06724df51b59c81d19303eea627c1d SHA-256: 685febdbe8128840f31868fe1128889d91a14b52193846f2e13229dadcc1f3f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dienlanhlongan.com/upload/files/tejilotejujamubexibo.pdf In PDF document text
    • http://sobateracota.ro/mm/file/vowuromelew.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nivexawimofakokuwepikow.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/42285595246.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/gekositunetox.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/nejeretemafogalewen.pdfIn PDF document text
    • http://artediapharma.com/upload/files/11994223076.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/perirorojanefifidufa.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/wejofiremoxegulu.pdfIn PDF document text
    • https://sopkambing.com/contents/files/nivibuliboginum.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/12084130340.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/bulilusa.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/komuxasaxitiforaka.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202108312235232567.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/65029732906.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/89045783110.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/49164001757.pdfIn PDF document text
    • http://guowangcable.com/d/files/tamaloz.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/tulexulug.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/merinezojotawusezesuwuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+of+dc+pandey+physics+for+neetPDF 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_off0000ac7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7D 10784 bytes
SHA-256: 1bbb40939420317e9003e861e23722161d0eaf9047173a3ceb696cb45ca272d2
font_01_sfnt_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 14572 bytes
SHA-256: 1599d177d1bc9f7e33971a00f10bec0cf51e53be091736e17db3e2f4c40a5d2a
font_02_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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