Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf139a863c309d8a…

MALICIOUS

PDF

116.0 KB Created: 2021-03-30 08:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78b47624a0d71c520421ecbd20317932 SHA-1: e410c2f0710babfb2dcadb400b5737b7fafa8466 SHA-256: cf139a863c309d8aee9b699a3057f4e905232f7979fb43c9bee8239348c3086b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which are embedded within the document's structure, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://nipisod.ru/wix?keyword=romance+club+answers
    • https://cdn.sqhk.co/fupokonabat/dJ0S6gf/5509447044.pdf
    • https://sajamokof.weebly.com/uploads/1/3/4/5/134599006/27841efd0c39.pdf
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/nodelapofodejo.pdf
    • http://numulul.mygamesonline.org/rifumopexuwarivute.pdf
    • http://domobifotuza.sportsontheweb.net/150_ml_de_agua_a_gramos.pdf
    • https://cdn.sqhk.co/minamojazi/ihGjbXW/rtc_bonneville_transit_center_address.pdf
    • http://fomijegi.mypressonline.com/zavakelatojirepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://teluroluxeterez.myartsonline.com/jixife.pdf
    • https://s3.amazonaws.com/desenaz/jidixurovuja.pdf
    • https://s3.amazonaws.com/fisulefajow/river_bandits_logo.pdf
    • https://s3.amazonaws.com/bagisi/adverb_clauses_and_phrases_worksheet.pdf
    • https://s3.amazonaws.com/zategafozasiru/salvar_tu_vida_alice_miller_descargar.pdf
    • https://s3.amazonaws.com/lebaxa/782903331.pdf
    • https://s3.amazonaws.com/toguvaju/zukubu.pdf
    • https://s3.amazonaws.com/nuxepiduded/bodomipa.pdf
    • https://s3.amazonaws.com/gebukil/98065478733.pdf
    • https://s3.amazonaws.com/safago/dwarf_guide_warhammer_2.pdf
    • https://s3.amazonaws.com/wujanozo/what_foods_are_good_for_gerd.pdf
    • http://gutekuretejapoj.onlinewebshop.net/the_apology_of_socrates.pdf
    • https://s3.amazonaws.com/luxaduzimase/xapebe.pdf
    • https://s3.amazonaws.com/xupovobejanam/luzanokifosamugowixuri.pdf
    • https://s3.amazonaws.com/vabedafozo/8876613059.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151d1.bin
705a40f2f1299da93398ac562f39fb8e280a7b0d058145836d6dafd55d8ad212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 6812 bytes
font_01_sfnt_off00016304.bin
cda51b80a8b07947c772e95b76fc72cb99b9d43d1ef3fc3bd25cd1b24290d401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16304 5184 bytes
font_02_sfnt_off00017496.bin
a7cb949b468e0aff25dd6a2b94327e25478eaa508f48174c26a66e6e836ebc82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17496 4840 bytes
font_03_sfnt_off00018730.bin
04f268c0b157609c22ec0eae0e7b041350bd625bba4081a9490bd9f051814203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18730 10780 bytes
font_04_sfnt_off0001ac1c.bin
c691c2dc236ff1c3149f8178f30dcb30456d959af2bd230901b395ad55359d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC1C 16208 bytes

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