Malicious PDF — malware analysis report

Static analysis result for SHA-256 919fc17513aa033c…

MALICIOUS

PDF

82.3 KB Created: 2021-05-12 10:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23af308f580545da9c7139e0ed2b91b8 SHA-1: d764bb2468aa7602c3cd65dc65d960008575170c SHA-256: 919fc17513aa033c91a83e013193f057777a85034de267dd33deede1c3197f9e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL is https://pelibifir.ru/strik?utm_term=microsoft+office+project+gantt+chart+tutorial, suggesting a potential phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://pelibifir.ru/strik?utm_term=microsoft+office+project+gantt+chart+tutorial
    • https://zupabigawobal.weebly.com/uploads/1/3/4/3/134326688/3bc85468.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_60637bf746a47.pdf
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/zuboda-kiwedonowem.pdf
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/falabelizupadix_jugitosefatefa_zilutidib_xajuletoramij.pdf
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/0c0404.pdf
    • https://cdn-cms.f-static.net/uploads/4403140/normal_600ba6f9195b3.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5fd6c82dea6bb.pdf
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/juzit_ponijo_savedi_zekebivij.pdf
    • https://cdn-cms.f-static.net/uploads/4488317/normal_600de63709322.pdf
    • https://cdn-cms.f-static.net/uploads/4375528/normal_60207bb323717.pdf
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/949d7085.pdf
    • https://xusofudubivo.weebly.com/uploads/1/3/0/7/130775679/jobimixanej_pedoniz_xuxatiniv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_b7781e1c21fe417589123ec078ba1666.pdf?index=true
    • https://s3.amazonaws.com/gawabog/champion_generator_3500_watt_dual_fuel.pdf
    • https://s3.amazonaws.com/nevovumowa/stuart_hall_cultural_representation.pdf
    • https://s3.amazonaws.com/xutomoxu/how_to_setup_hl-2270dw_wireless.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_9063ed98b1ec4d92adeb83c511e00226.pdf?index=true
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_acf25cf43c154fc58af5c8164f8ffa54.pdf?index=true
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_d4368fbaf7d94346b9ddd50678671b4b.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f542.bin
640fb2bd9d55a67b77d80bfb6d6e1921ac3a92468ccbfb356b7a291978f7b5e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 5240 bytes
font_01_sfnt_off00010716.bin
5221a10d0571f8a5463e232b107937d7069d569eb1a7e13e1e389095fdfe2eca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10788 bytes
font_02_sfnt_off00012c18.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 4324 bytes