Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0c9ddbbcd057ee…

MALICIOUS

PDF

88.9 KB Created: 2021-03-26 10:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7a32bb6b6c5cb2248a6618ced2c96b8d SHA-1: c9373f14b4b45cfe6f0f6159a03a460c2a34016c SHA-256: 7c0c9ddbbcd057eeaa613b75c8061d5f01416ba798e8df1a13c195548ed100e4
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://fokemale.ru/strik?utm_term=asus+z97a+manual, which is likely part of the malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=asus+z97a+manual PDF link annotation
    • https://wowimenus.weebly.com/uploads/1/3/4/7/134709331/8672482.pdfIn PDF document text
    • http://puxutare.22web.org/nitiwuma.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/border_song_video_free.pdfIn PDF document text
    • http://tigadugutuvatix.mygamesonline.org/ambrose_bierce_owl_creek_bridge.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/tujuvirew.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/fusionner_en_ligne.pdfIn PDF document text
    • http://itgermany.net/world_war_z_crossplay_voice_chat_not_workingj9ibf.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/ceeed7aa5b.pdfIn PDF document text
    • http://mabojexovepa.22web.org/carisma_coyote_manual.pdfIn PDF document text
    • http://cafechorsu.ru/stochastic_calculus_for_finance_shreveizbpi.pdfIn PDF document text
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/8568429.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/tunabidukudi-telepi-purazotojifutoz-dopiwidu.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/19913090870.pdfIn PDF document text
    • http://dfwshootersupply.com/rizetunolevamasovumai83bn.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/27466442934sr248.pdfIn PDF document text
    • http://moneymaya.site/cycling_loire_valley_self_guidedpoq1j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_7896ddceb4c34914ab19e617157ae6d4.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_9fabb4c06d794d5cb9bd4ebe31e52a0b.pdf?index=trueIn PDF document text
    • http://nujovelu.rf.gd/85897986427.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_4c586a710a434698abb5a41e3d56bed8.pdf?index=trueIn PDF document text
    • http://lebusepuwiri.atwebpages.com/pasemujizuzu.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 5008 bytes
SHA-256: e83e0a6d2a59e023a71266a923d57e4b101952bfd1b6ce1ae84cb7f5c62c7efb
font_01_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 11144 bytes
SHA-256: 40ac23b7b744f14e9910bbd9e13a90175fc212d28b244ac3d5c49ba4c52b72cb

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