Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a463735c061b111…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 13:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb120416ae469e11726698b4710b84a0 SHA-1: ec3f11de8ce060b98e69c1e9d5a5b477af732a5d SHA-256: 1a463735c061b111549552a0003e775b9b107c2d8994f168dd119cedd9159c6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=guitar+chords+key+of+b
    • http://benrassam.com/uploads/files/43250091254.pdf
    • http://ristorantebiscione.com/userfiles/files/rinikupomapiwumufatuj.pdf
    • http://burattinojatek.hu/userfiles/file/13313462865.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/merikowifolifegojupupo.pdf
    • https://bestcoloringpages.com/userfiles/file/limolejo.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/16743315544.pdf
    • http://tuecpa.com/file_media/file_image/file/95218112248.pdf
    • http://newbiiz.com/upfiles/file/81899749993.pdf
    • http://logicparcel.net/uploadsEditorfile/85220795464.pdf
    • https://ikuseikyokai.jp/ckmedia/files/jurow.pdf
    • http://budoprojekt.eu/obrazy/file/88530424426.pdf
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/78636109576.pdf
    • http://www.drivingschool-brno.cz/files/files/28446279072.pdf
    • http://crabandclaw.com/uploads/files/51450580323.pdf
    • https://trieurodata.ro/images/file/supunufebalesuxitedur.pdf
    • http://ccshecea.org/upload/files/32756853433.pdf
    • https://ibshospitals.com/userfiles/file/83246100728.pdf
    • https://coonvalleycc.com/userfiles/file/kekedeporamuzuzisar.pdf
    • https://firmabudowlanawalczak.pl/web/uploads/files/damemarezi.pdf
    • http://technimexvn.com/images/ckeditor/files/rakup.pdf
    • http://terredellamagnagrecia.com/userfiles/files/pukinug.pdf
    • https://ikomsolutions.com/admin/userfiles/file/fexoba.pdf
    • https://premiersuli.hu/files/files/wisobisibubodujajilikigo.pdf
    • https://whitepalacegrill.com/userfiles/25941871720.pdf
    • https://nirkongrp.com/ckfinder/userfiles/files/mavuv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a5.bin
fccb9b7cb150fc7655689543088cb375cfdba2534de6f75b06ff8e0dfa35a374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 10908 bytes
font_01_sfnt_off0000fa23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 16792 bytes
font_02_sfnt_off00011235.bin
63e3b0566e4e518c6a9993f0ad428fbf3d028d5ed960efecc13973690f7e9478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 17188 bytes

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