Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c7311f8e70e451…

MALICIOUS

PDF

68.9 KB Created: 2020-11-25 22:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd7b6cb24c362d06f155aec5ed307355 SHA-1: d60b6bd2c3a2f7b902e5202a84238dde26b2b101 SHA-256: 73c7311f8e70e451ade5767fc23013a4f794c3b8c3d89a6d4560116ba7b45ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, with a critical heuristic firing for a PDF link farm. One of the primary URLs extracted is 'https://traffset.ru/123?utm_term=two+ways+to+belong+to+america', suggesting a lure to a malicious site. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=two+ways+to+belong+to+america
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5fa2309c2b95e.pdf
    • https://bexatumabe.weebly.com/uploads/1/3/4/8/134852132/jiwegigupuf-kumiwapubu-desizatol.pdf
    • https://lofizalu.weebly.com/uploads/1/3/4/6/134601384/lilop-fopages.pdf
    • https://takotifisusa.weebly.com/uploads/1/3/4/4/134499816/lagune.pdf
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/sodasave-gesuta-meditonep.pdf
    • https://tetobalowuw.weebly.com/uploads/1/3/4/5/134523757/wumorivexu-zaxopiludulu.pdf
    • https://zuzumapi.weebly.com/uploads/1/3/4/3/134344149/6d2845.pdf
    • https://kefanizitadibuz.weebly.com/uploads/1/3/4/3/134328212/zuseluvuses-totagu-pusiwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f349114-bb42-46c2-8947-f82ea6dc119d/dictionnaire_francais_arabe_telecharger.pdf
    • https://uploads.strikinglycdn.com/files/94bcee0d-d67f-44a6-be3b-85b59d6d42c1/exercicis_pronoms_febles_combinacion.pdf
    • https://uploads.strikinglycdn.com/files/077e969b-ae32-4cd6-9b65-a6223be45476/lyrics_to_i_see_the_king_of_glory.pdf
    • https://uploads.strikinglycdn.com/files/9eb4ac7c-efab-426d-b229-7494d9914179/8066081557.pdf
    • https://uploads.strikinglycdn.com/files/6ed4c0e2-dffe-4218-93e5-ad863a15a36d/12793960935.pdf
    • https://uploads.strikinglycdn.com/files/eb1c0c69-3bdb-4931-90b3-6a5bad7fb72f/noxabojisux.pdf
    • https://uploads.strikinglycdn.com/files/3f1199c9-1b1f-4f10-b47c-c7dbd110ca0d/76765969440.pdf
    • https://uploads.strikinglycdn.com/files/abccea83-e831-47ab-b055-dc53cc2ae720/solibodamosulugef.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea3.bin
8d7fd96213c77a4e20b0e0c0e0fadfbbf8c2ffb5ba8b41d0a06be390e78e1a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 5404 bytes
font_01_sfnt_off0000e10a.bin
9158fa7f91c4313fca922818f7a765ba474bb170666235ddc807754be13e8a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 11352 bytes

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