Malicious PDF — malware analysis report

Static analysis result for SHA-256 939b09008e61aad8…

MALICIOUS

PDF

100.8 KB Created: 2021-03-03 01:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 409491fbd6fadac3653ef45d6e6cd223 SHA-1: d3098fe3e79cb293cd89d0861f1a0ebe012940e2 SHA-256: 939b09008e61aad80b7a81c2bac3439c00642cd085af1dbb42cbccafff0cd566
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=what+are+the+dimensions+of+a+field+goal+post PDF link annotation
    • http://portkamesto.site/chase_checking_account_balance_sheetoumrs.pdfIn PDF document text
    • http://jimubezisu.iblogger.org/baldi_s_basics_apk_full_version.pdfIn PDF document text
    • http://creamwalls.space/can_i_play_bubble_shooter_offline4w474.pdfIn PDF document text
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/fuvawetudewibaxejoxo.pdfIn PDF document text
    • http://rijesukedad.22web.org/setutuzisibome.pdfIn PDF document text
    • http://wide-mean.top/warframe_cellule_orokin_farmwas8k.pdfIn PDF document text
    • http://detonic-deutschland.website/rewoded4wlgv.pdfIn PDF document text
    • https://gukejokofa.weebly.com/uploads/1/3/0/7/130739315/6223266.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/7998676.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/dQicujj/last_day_on_earth_valuable_survival_diary.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/37d4f303e96331a.pdfIn PDF document text
    • http://3203epworthcres.com/peterbilt_386_service_manual3w3yz.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/ikBjdhh/crashlands_wiki_arrangement.pdfIn PDF document text
    • https://viramerobudob.weebly.com/uploads/1/3/1/4/131483281/9e3c6ab1182.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/gehbIgt/80799372646.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/rogugagatuf/bticino_manuale_cronotermostato.pdfIn PDF document text
    • http://kugaxupupoguj.rf.gd/85805042361.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/aashiqui_2_2013_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/automobile_spare_parts_business_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/7510113335.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_off00014c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5A 5468 bytes
SHA-256: c96b803728013e09a6bff93ce69be527a25e2467a56ac2e260425f92235491b0
font_01_sfnt_off00015edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDC 11352 bytes
SHA-256: 549ee806003bd6779f5424c38c5443343654e2e661cd2b44267534d5d8f28429

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