Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cfd30c29cb8d40…

MALICIOUS

PDF

79.2 KB Created: 2021-10-14 06:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 39b5c91751fa1cb8e311749aed7b2902 SHA-1: 85350d1c5f4153693673abdb0e28eff761b044f4 SHA-256: b4cfd30c29cb8d402f95dad2b6e575996ded25c7aace60ecf22c7453cfa85815
134 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 on disposable hosting. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/vuniziwerubev.pdf In PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/30826976505.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/fetajapewawego.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/jogamotobokofogomodakegu.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/sadigepukomi.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///ximuvizame.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/xelafumuvupunakigeto.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/80825619176.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/jamebovo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155c0659ac62---xepatuvasusasemitolisig.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/37373832968.pdfIn PDF document text
    • https://pitbulllocksmith.com/nbloom/fckuploads/file/kuzagomezididi.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210909013027729152npxgp.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13586326775.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tagufibipamafarimurax.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/bajosujoxaxux.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/naferekejelas.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/74764242937.pdfIn PDF document text
    • https://togeltop.net/contents/files/17999629733.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/tapib.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///81628766332.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/jisuxetotesediwatudilu.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/7091623754.pdfIn PDF document text
    • http://kahasat.cz/data/file/44109049691.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/9731594448.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=idm+not+downloading+from+chromePDF 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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 10792 bytes
SHA-256: 9d1d61f2c2c830cdae6765a29de914ede3caad21e6b03cf0834af3f2dc19975d
font_02_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 17936 bytes
SHA-256: 0b814fa40391347b8548b2202c232812c8fc8bf19f399949560b177c26902636