Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75df38986610fe3…

MALICIOUS

PDF

75.2 KB Created: 2021-05-28 22:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6c06e748c139e0538916310f64bd545 SHA-1: 100cfc939435fa46e10185db8bb70d907a23f5f8 SHA-256: c75df38986610fe3cb20aa2d8ad660ca1a477436652232913891a236065ee483
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are SEO-optimized, suggesting a link farm designed to drive traffic to malicious sites. The primary URL, 'https://dafemum.ru/strik?utm_term=download+gta+5+full+game+for+android+2020', is presented as a download for a game, which is a common lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=download+gta+5+full+game+for+android+2020
    • https://cdn-cms.f-static.net/uploads/4462775/normal_6037eda2d72ad.pdf
    • https://velotukuzikud.weebly.com/uploads/1/3/4/7/134722024/ratidapetepipebasije.pdf
    • https://xisaxori.weebly.com/uploads/1/3/5/3/135324705/c46f764f1cced31.pdf
    • https://cdn-cms.f-static.net/uploads/4410985/normal_6021a21e6611a.pdf
    • https://cdn-cms.f-static.net/uploads/4486565/normal_60493d9fa110c.pdf
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/3af3b028cf2cdc.pdf
    • https://wuzusujozibavil.weebly.com/uploads/1/3/4/6/134689519/3680879.pdf
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/fanigi-kupidam.pdf
    • https://cdn-cms.f-static.net/uploads/4448116/normal_601e5f54da1b9.pdf
    • https://cdn-cms.f-static.net/uploads/4379852/normal_605d8d1198b1d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4377109/normal_60aff9a93087c.pdf
    • https://xajasobuz.weebly.com/uploads/1/3/4/8/134861619/joguwufamarakukog.pdf
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5fcf60e664f3c.pdf
    • https://cdn-cms.f-static.net/uploads/4378160/normal_604b0aa0aa9ea.pdf
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/lisevezugixap_rufigudulu_voweratarukur_rijon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/af08d039-5934-420c-a542-c5a0df3d211b/79919913746.pdf
    • https://uploads.strikinglycdn.com/files/27670373-4144-440c-8bed-99453e88041c/84399671513.pdf
    • https://uploads.strikinglycdn.com/files/b2a30e92-90b8-4f5a-bc97-291d4b15dfdd/8076270717.pdf
    • https://uploads.strikinglycdn.com/files/825b62a0-f4bc-40ae-97b7-8816d998e6bc/9058191196.pdf
    • https://uploads.strikinglycdn.com/files/17cf269a-33a5-4167-9622-7dbb0ec3e4fc/samsung_galaxy_s20_ultra_review.pdf
    • https://uploads.strikinglycdn.com/files/fd29619c-6e1b-475b-8522-995dfc55f9d7/how_much_does_dollar_tree_workers_make.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_off0000e849.bin
f9cf77b72d895845878c01fdb672e033ba177f743561a5f9ce51c31595d0b298
pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 5536 bytes
font_01_sfnt_off0000fb2c.bin
d97526c52a4c8a0da4760335e949b5b337d075dedc900a476fb73d8243142e44
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 10564 bytes