Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34411d95375190c…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 08:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 77737d77cf025fca7375522ce5e4c853 SHA-1: 2fcc12e8b6e90329063ba91df16b104f5a97a294 SHA-256: a34411d95375190c899833ffc66121a93db062d8e15d8e06d0d033cd1dacd50d
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high heuristic score for being a link farm on disposable hosting. The embedded URL `https://seumenha.ru/strik?utm_term=food+tech+angel+investors` is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=food+tech+angel+investors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376086/normal_601e53486bdd8.pdfIn PDF document text
    • http://mesretly.xyz/bonhomme__habiller__imprimerlabtt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_602a194d11302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fcbf6f2a2716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_6033b8f90a28c.pdfIn PDF document text
    • http://secureappeal.com/are_honda_cars_expensive_to_maintain_in_indian4dcg.pdfIn PDF document text
    • http://rezltml.xyz/62986744738olqa4.pdfIn PDF document text
    • http://nuverlites.online/3022806580956nwl.pdfIn PDF document text
    • http://idealica-ufficiale.site/73813818601k34et.pdfIn PDF document text
    • http://raisinsapp.club/sunbeam_bread_maker_5891_belt_replacementl0zfw.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/62502455553xyvym.pdfIn PDF document text
    • http://gallery-shop.site/standard_proctor_compaction_testsk1zz.pdfIn PDF document text
    • http://kersita.space/circuito_cargador_de_baterias_12vu871k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_601e68c6ee2e3.pdfIn PDF document text
    • http://7lessons.website/783124404432vdcr.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/wujapu/36884299766.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/dopojitig.pdfIn PDF document text
    • http://bulizodizizudid.rf.gd/76955137121.pdfIn PDF document text
    • http://kitasiru.epizy.com/aprender_portugues_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/nekolajipinuzemirepesore.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/android_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/86845460377.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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 5216 bytes
SHA-256: 6c87a44783db887ff304adde8e50e5da12a18d0ca19da42f238f339dae092d73
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 11788 bytes
SHA-256: 64e582146f029faefd0f2b0b86d4d8b7a6eea7f8c70b356decd00755c05c7cc9

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