Malicious PDF — malware analysis report

Static analysis result for SHA-256 350b90d66a529161…

MALICIOUS

PDF

78.4 KB Created: 2021-04-03 23:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7694e53bc8e03b1e26f81f07a15967b4 SHA-1: 9ba4755e9e1741c14e2198d4eb4d0c915258844d SHA-256: 350b90d66a529161291b99afab8f3e5cd76bd635d28850bf072337686b35883f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://soxebez.ru/wix?keyword=why+are+babies+like+hinges+math+worksheet PDF link annotation
    • https://setunifajufin.weebly.com/uploads/1/3/5/9/135989633/fibegamup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_60058e466091d.pdfIn PDF document text
    • http://excschool.ru/kemufel7ph3.pdfIn PDF document text
    • http://sexedate69.site/tubisutidarisup59rj.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/bexomimerizipe.pdfIn PDF document text
    • http://websporizlehd.com/12341632958txmtu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_605ef6cdcd6ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465397/normal_60002eadd7434.pdfIn PDF document text
    • http://numberoone.xyz/oreck_air_purifier_customer_servicegua9o.pdfIn PDF document text
    • http://servisvds.ru/do_pisces_play_gamesquxro.pdfIn PDF document text
    • http://kvadro63.ru/what_is_included_in_adobe_acrobat_standard_2017uhkqg.pdfIn PDF document text
    • http://copyright-security-ig.com/85310922703by9id.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/vezikapiwazube.pdfIn PDF document text
    • http://leopards.space/4607868496mjo8v.pdfIn PDF document text
    • http://universe1.space/ambedkar_dj_songs_kannadajdqq3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonizevugopu.rf.gd/33234388045.pdfIn PDF document text
    • http://wifapejaxim.rf.gd/katy_perry_firework_sheet_music.pdfIn PDF document text
    • http://kuwosuz.rf.gd/nefropatia_diabtica_fisiopatologia.pdfIn PDF document text
    • http://xafojoluti.epizy.com/83327805874.pdfIn PDF document text
    • http://matimok.epizy.com/arbol_de_la_vida_cabalistico.pdfIn PDF document text
    • http://fukasutatota.rf.gd/9689491016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 5508 bytes
SHA-256: 51a49a45ffd613cf532cd3da80607f53616d16fcdbb05889687c789df800626c
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10796 bytes
SHA-256: 575827db45362e3904a59e78e0331e727e023a924ed60f6987e03b841297f545

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