Malicious PDF — malware analysis report

Static analysis result for SHA-256 5856c724e421bab8…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 21:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01ff032f2b4cbc8bf61d35a54873c4c5 SHA-1: dfb10a3fda602d57cb58d10f803f76ec6e314760 SHA-256: 5856c724e421bab8352c5961b88554015311c581287f0cfeaf6af94a623a58ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or scam lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://oniceh.ru/uplcv?utm_term=bikini+avengers+online+movie PDF link annotation
    • http://ozdesignhouse.com/app/webroot/uploads/files/tikujibimugom.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/371cd2ad95e5836b55db5f464433d96e/gowale.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/63f606e31fbf5e4acf0b525c414d15d4/14613370096.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/xudenevojex.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/87615042739.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/54942662952.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/12260561162.pdfIn PDF document text
    • https://mytopics.it/uploads/file/fosub.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/43899916201.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/gokupufosanobabe.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/61137159099.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/pixirasovemajorav.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/koxiluregedojivenekeviv.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/sopego.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/mazerivonesivabogiwekulu.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/85908396157.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/gafibebejekeregamowo.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/24389334386.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/xivukidadikuwuxibowefenes.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/90017929000.pdfIn PDF document text
    • https://telorgabus.com/contents/files/xojanafaponabowajezever.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/lalezolovibakojakik.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/rudufomiruf.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/vojojemivuzagerasamofonas.pdfIn PDF document text
    • 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_off0000b0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16832 bytes
SHA-256: 85c6374eddb22c3ca3a67ec1848e4b238ef0b04afa9de3335bce9a19b8ce3540
font_02_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 10564 bytes
SHA-256: 9a6c6b5bd836deefda9864e0be8bd567645cd0611cbdc10534318d65649c2ae6

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