Malicious PDF — malware analysis report

Static analysis result for SHA-256 de938d12ee60863a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 22:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46bb444939100d46ff282db3e726f95f SHA-1: a6ba1853948c5b4342e1c3a0115949b5542f1fe0 SHA-256: de938d12ee60863a2dd4cf8acf8d4ec95b8867c99140a626e6ffdd5a5f8090f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to potentially malicious or phishing sites, suggesting an attempt to redirect users. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

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 http://m2m2design.com/userfiles/15148039692.pdf In PDF document text
    • https://jnnjhansi.com/userfiles/file/dutigo.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/36435136801.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/wuzebexareximurazutajotow.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/40365913399.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/93205905351.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/68450686753.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/31104717407.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/goferuzivofosonalarimif.pdfIn PDF document text
    • https://masukpt1.com/contents/files/24712964307.pdfIn PDF document text
    • http://vucert.vn/uploads/files/66653939869.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/jajilozale.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/26738192213.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/masebilo.pdfIn PDF document text
    • http://lj-group.cn/upload/files/teven.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/76878009304.pdfIn PDF document text
    • http://rapet.hu/files/gebepazazojagelotifow.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137caae39903---21827738701.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/nopub.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/35041299709.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/35649087482.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/masowutalutadunal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=god%27s+own+country+full+movie+123PDF 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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 18652 bytes
SHA-256: 457dc4284e38d8b29b81f420f32fe1c914324720d2da7a8c7efdd900691ee722
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 11256 bytes
SHA-256: 055e5e3b7c044d3b726bf4c77313a1d31281d30d6c51971c178389ae3cbe5218

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