Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2f315ed61b4f40…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 16:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 442401d725a579227f7f8c0c319d3cd2 SHA-1: 83c877fe9b85bd212d13a8d92935670c2b447357 SHA-256: db2f315ed61b4f40bc2aba647fd4f4027e2fb35048753d5844ea11de6806d868
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, suggesting the PDF is used to drive traffic to these sites, likely for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://shqinze.net/admin/upimg/file///muzonotozafotefowujat.pdf In PDF document text
    • http://soundspace.eu/Upload/file/72812734718.pdfIn PDF document text
    • https://premium-house.uz/images/file/japirig.pdfIn PDF document text
    • http://packamate.com/userfiles/73030847532.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16148c87b504c4---gozinelimumalajovokesijep.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/15705722660.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/50864722461.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/kemizigil.pdfIn PDF document text
    • http://whygzy.com/Media/Uploads/files/witotizemidu.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/88163878498.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/sopako.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/41523792939.pdfIn PDF document text
    • http://sgpeo.pl/users/file/foxopusumapav.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3d8047bad80c320d3b6b8ba93aacc26f/sizukexotodinabenojub.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/25145735785.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/tixeremujumolepewelas.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/sofiva.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/64182675091.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/zifetifapajapu.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/radiwowatopibutodiwe.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dawubigetixavavilivatuj.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/vudokiwadajumafudo.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/38549186848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=friv+electric+manPDF 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_off0000b2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 17296 bytes
SHA-256: ce05a147d8d78a1a51dc98f69eecb486cb8fbfaacbdd729b9798f14960da3023
font_01_sfnt_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 10144 bytes
SHA-256: 1b20f465b2fc1466fb8c70122aefe4f7eb834492625886b31258dc2bda1c71cc
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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