Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd942866c154e0a…

MALICIOUS

PDF

76.1 KB Created: 2021-10-03 14:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5c516ac10762659e108836307d87ce15 SHA-1: 41fb2772a0b6bb2c9116f97b17ad5ed046b56307 SHA-256: 6dd942866c154e0aa2f973fad9611564eed0044b057dd2a183fb95aa486db074
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to obscure the true destination, which is a PDF hosted on a disposable domain. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mkontakt.pl/dat/file/54125634915.pdf In PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/velonolezukazip.pdfIn PDF document text
    • https://latework.cz/soubory/44681068209.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/97439257346.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/fagisigo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j844jttpl72q6qnlpa7nslmncf/6751884937.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/62423321035.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/49723328935.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/68676408184.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/segijovibopepemen.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/sunowus.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/47578622130.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/fokanikawazogoxozobibi.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tebovuwarazosilu.pdfIn PDF document text
    • https://12shio4.com/contents/files/44640962415.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0fcb00bc6---napapureket.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/68932916880.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/vegunug.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/61778607426.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/55382769529.pdfIn PDF document text
    • http://e-menu.hu/editor_up/wusimafojemutux.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/31269571335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+of+chapter+tissue+class+9PDF 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_off0000bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 19360 bytes
SHA-256: 821b6683b0ba6f3a6ee3085bb3b10048a5c2c19d0846feccbffe510e28a8258e
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 10884 bytes
SHA-256: f1717008d5ef57c1c92f4d917cf3f71b78ca894e966f1a3218d788935e689026