Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed1016341dcc82a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 16:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: eb73f91324943ec9a322af3c18e895c6 SHA-1: 9b7860a52adcd0b0b29f25cf035abfe4821b633c SHA-256: 4ed1016341dcc82a012891ad6727440f7e8cb3f6823ed9c725305b6722b924c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://natanashoes.com/kingkong/userfiles/files/63744313034.pdf In PDF document text
    • http://totoquynhhuong.com/upload/files/bakajowatutizavesib.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/76635858091.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210905192611040752m7agyd3dig48.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/70445916456.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202194224549458.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/39654854030.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/97840170788.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/15355064257.pdfIn PDF document text
    • https://ptogel2.com/contents/files/10487352900.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/dimejolewabinanajix.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xafigofavobomud.pdfIn PDF document text
    • http://carszana.com/image/upload/File/rigizawojegonewutagimojuv.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/93056245379.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gubojaterewomewodije.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/49150078769.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zopepef.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/68601799519.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/madijinozogekari.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/85826531034.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/57121200595.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/jawibabexidimimozez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+take+a+screenshot+on+snapchat+iphone+without+them+knowingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 11044 bytes
SHA-256: 060ad6d4af6101d2a983d2c5abd92e4ac188f208dd0679d56ac31d721821e66d
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 17028 bytes
SHA-256: 6772f2a78a6ccf5f945d5214d722cf7407920ba0bd531f0ba28de7e0139d6199
font_02_sfnt_off00012471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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