Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f0fb278bb6a248…

MALICIOUS

PDF

89.1 KB Created: 2021-04-27 23:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0321b92db945940817742288123c8536 SHA-1: c0b34d8d9e41ba1310aa6542ee426b7016cf6ea9 SHA-256: f5f0fb278bb6a248b2bd5c0455e231dd33e8ef03c0512c4cacc1c77e14277b62
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=schwinn+airdyne+ad4+console+manual PDF link annotation
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/fuvifojomejo.pdfIn PDF document text
    • https://jobuvofuwado.weebly.com/uploads/1/3/1/4/131483112/jorug.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/o_humanismo_na_literatura_portuguesa7ruf9.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/15868214815.pdfIn PDF document text
    • http://ulekschool.online/lenivavebaxefixifehyzas.pdfIn PDF document text
    • http://autolombardpro.ru/police_siren_sound_mp3_download_free3w740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_6031d1dad3675.pdfIn PDF document text
    • http://mxbur.fun/59130495829ogta9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_605ba577656fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_604078583116b.pdfIn PDF document text
    • http://nat-yoga.space/3379063203j2e5x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_6033a8adca956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/which_is_better_jbl_charge_4_vs_xtreme.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/how_to_turn_off_viper_car_alarm.pdfIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_5bb8d814aa194ec6942773866303ff7b.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_161fbd43e4cc4f2a86e48066c31e3683.pdf?index=trueIn PDF document text
    • http://nasakitubaribud.rf.gd/the_poky_little_puppys_first_christmas.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_cbfaa94047d04844bc9673ccd1003484.pdf?index=trueIn PDF document text
    • http://muxenad.rf.gd/pharmacotherapy_by_dipiro.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/jomoxidenuge.pdfIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_196d271033d24ae1b33061d73712ee76.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_e983745a5b104d63a70633771cfe7d35.pdf?index=trueIn 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_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 5564 bytes
SHA-256: 67745e63b774085e31727d8ceeb38666bb5b0aef403d0392d4f07d50b94d4539
font_01_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 12580 bytes
SHA-256: b1874cf9298f4878ba614ac548f8371b1d71b74ac646efa1995f0bd6a6005693