Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9875694b7e9d330…

MALICIOUS

PDF

89.2 KB Created: 2021-04-05 23:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9f91f2e6f48f88952413c24346474d8e SHA-1: 2ed37586f551baa49198434a19d22024a3609a5f SHA-256: f9875694b7e9d33081ebb7c860c7c6aa2328183f1f501e951cc2920b4c066ec6
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://nipisod.ru/strik?utm_term=pensar+rapido+pensar+despacio+analisis PDF link annotation
    • http://importants.space/secured_promissory_note_template_californiac36vh.pdfIn PDF document text
    • http://speak4pro.com/serial_number_for_illustrator_cs6mbp7t.pdfIn PDF document text
    • https://rumidevuj.weebly.com/uploads/1/3/4/3/134310249/jafedivo.pdfIn PDF document text
    • http://strgb2.ru/gebuwiduwifodadupawuxekadlzgjc.pdfIn PDF document text
    • http://claire-irk.ru/bazutezxi44w.pdfIn PDF document text
    • http://soul-felt.com/how_many_spell_slots_does_a_level_4_paladin_have45qnt.pdfIn PDF document text
    • http://visiblawty.com/36468576303yvbou.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/f9919d48ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_60386c746380b.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/wutorusug_vozud.pdfIn PDF document text
    • http://apelsins.space/filuxixudojaxv3cqa.pdfIn PDF document text
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/3389598.pdfIn PDF document text
    • http://lightsex.ru/diamond_infinite_edge_pro_bow_reviewyvvd3.pdfIn PDF document text
    • http://ihsteam.ru/the_lady_of_the_lake_witcher_epub_downloadrw8po.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_602787a5792e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5ff262b208d59.pdfIn PDF document text
    • https://kiligazifozu.weebly.com/uploads/1/3/4/5/134506598/vuxafudugamufet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 5068 bytes
SHA-256: 677e717286db5df1fe46a0f141c3e5324226dea96120ddfd603f40afc3ee6996
font_01_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 12844 bytes
SHA-256: 2a741cd6e7a3053649069e68deb0ced290e7ec8bb3aeb619b5632e92b242a757
font_02_sfnt_off00013f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F95 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

Open this report in the interactive analyzer, or submit your own file for analysis.