Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea68bc38d9bd1ea…

MALICIOUS

PDF

76.8 KB Created: 2021-06-03 05:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5481c4b36de6b57aec14e68b62332b16 SHA-1: 4bbab37e584f2ab8ec0b2b522ff2680c19d9813c SHA-256: 7ea68bc38d9bd1ea907df92e8c08227ecae93fea83d78b979ae7b7f6cfe3fea9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to direct users to phishing or malware sites. No scripts were extracted, but the presence of numerous external URLs suggests a redirection or download attempt.

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://medvor.ru/pbw?utm_term=what+is+standardization+of+naoh+and+why+is+it+important PDF link annotation
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/3860109.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/texewe_degulojowapu_wuvup_zowopevevuva.pdfIn PDF document text
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/7767234.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/lawiv_fegarajimodiko_gosolad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475563/normal_5fdfcda67df65.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/zufobuzipitotef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481830/normal_6008b8f407cf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5ff25cb82eb4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_60254fdb1c0c2.pdfIn PDF document text
    • https://zitolibozix.weebly.com/uploads/1/3/4/0/134040523/08fa5b2bb93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_600f10839ce10.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381287/normal_60b1c9fce541c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_60147918e055c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_604fea5105a61.pdfIn PDF document text
    • https://jebupamix.weebly.com/uploads/1/3/6/0/136098333/nuren_fawimud.pdfIn PDF document text
    • https://gibuzilo.weebly.com/uploads/1/3/4/6/134602166/tapef.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/bamonurav_rovezotikilafa_tapopi.pdfIn PDF document text
    • https://koborabi.weebly.com/uploads/1/3/0/7/130775888/puwagovumewedi_gekivoresinal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijomirurefi.pbworks.com/f/los_pronombres_reflexivos_en_italiano.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144505512/gomimubopozagoza.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144536295/34229133080.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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 5504 bytes
SHA-256: 85e6c5ec0dd76edeca6b93929c8b9472bfa39c8861f24c383bc87d6e37f549d6
font_01_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 10812 bytes
SHA-256: 0313143ac6df5b09a5f244712b9a257d10184dfa6720813ee5ec60806429b0eb