Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5a45d32e0c377e…

MALICIOUS

PDF

80.1 KB Created: 2021-05-18 05:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0c333ee2c7a50d0eb10c4058bfa5d38 SHA-1: 9d9fda3d42722e6f4690ebcf3877b4a30ab39746 SHA-256: 4f5a45d32e0c377e17d1f764a513507bbd85e51364f6a743400d7ef246cf5910
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=example+of+scope+and+delimitation+in+research+paper+pdf PDF link annotation
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/244967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_6038641bf2437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_604494dadf320.pdfIn PDF document text
    • https://razivixa.weebly.com/uploads/1/3/4/4/134498077/rugubojot_zemasekevif.pdfIn PDF document text
    • http://vezokikawelin.iblogger.org/experiencing_god_leader_guide_free.pdfIn PDF document text
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/5011461.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/726366.pdfIn PDF document text
    • http://kofoxirozagitu.iblogger.org/harta_apuseni.pdfIn PDF document text
    • https://bifukedupojuxi.weebly.com/uploads/1/3/4/4/134498794/d496e8c6dead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_6048143f34020.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/9660870.pdfIn PDF document text
    • https://zukujiwad.weebly.com/uploads/1/3/4/4/134491014/fb82ce.pdfIn PDF document text
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/kevapo_fesopus_bivapatoripuz_guwodajunusa.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/2e64f2ec2f03.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/3a43e542b.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/nevowimo/98523153890.pdfIn PDF document text
    • http://jesebikalag.epizy.com/grammar_worksheets_for_8th_grade.pdfIn PDF document text
    • http://wupogegefug.epizy.com/47729782590.pdfIn PDF document text
    • http://nabiporemug.epizy.com/math_coordinate_worksheets_that_make_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/fumupuma.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/fitted_bed_sheets_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/how_to_replace_alarm_keypad_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/how_to_start_vishnu_sahasranamam.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_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 5420 bytes
SHA-256: 72035778d13fe056742acc667317d821056ea432c1bc95a5b5558a1aa12f8d62
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 10756 bytes
SHA-256: ebbf3bc0b3510287cd004a06e477f519f450504de70cf57d5ae7ae430789addc