Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc54abf0dc58e458…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 07:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e79f4f1244c30ef7d0e95259ec293910 SHA-1: 5fc9ac141eaf8076f8bfac2b63c7793e9b348183 SHA-256: fc54abf0dc58e45801dfc63e2780256afecacd47927b02739c42632e49361f05
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pastravariaizvoarelebratiei.ro/images/file/tixejokizugatebivufimod.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/63970765253.pdf
    • http://rileyillustration.com/images/agency/files/99718964111.pdf
    • http://godsownproperties.com/userfiles/file/80661816248.pdf
    • http://evo-models.com/uploads/userfiles/files/madegawe.pdf
    • https://rossbeede.com/userfiles/file/bufugisepujunajeg.pdf
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/4947158073.pdf
    • http://valdhans.cz/userfiles/file/tojedeje.pdf
    • http://clinicaveterinariacittadivignola.com/userfiles/files/pilinepakajapi.pdf
    • http://dilimkebab.com/userfiles/file/rizenelesamekonizakuf.pdf
    • https://groupekineconcept.com/userfiles/file/xizivabe.pdf
    • http://gorsilawfirm.com/userfiles/file/zosawi.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/dokewutejosaxevefajirokor.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/56859233281.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/55c42d0972d84e8fa32116180006aeb7/73747886087.pdf
    • http://tuttotop.com/userfiles/files/gupenofavebedi.pdf
    • https://lecachet.fr/docs/files/63697340235.pdf
    • https://goldenlinejsc.com/userfiles/file/talezotegozukumixaxuvez.pdf
    • https://verticala.ro/images/userfiles/13780468609.pdf
    • http://rexant.by/upload/editor/files/85081128534.pdf
    • https://oferta.lt/i/File/19655338985.pdf
    • http://karate-talence.com/newsite/userfiles/files/xatabi.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/eb468256aee94e7145d7c27918507332/muzida.pdf
    • https://bagstyle.uz/images/file/98721665060.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=remove+%26+add+watermark+apk
    • 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_off0000f3f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16792 bytes
font_01_sfnt_off00010c06.bin
d6be57e22e150506457f94d2f4c78d04e0406281b214a1850386ac58cff68569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 18256 bytes
font_02_sfnt_off00013b21.bin
ade46d94f249fec970829b9b68c2a69ad5b67a75d5348e225de93747b8b839b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B21 9604 bytes

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