Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4afc90e48cb737…

MALICIOUS

PDF

73.5 KB Created: 2021-02-27 23:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa1b29ea39597d828d3486ea03d97979 SHA-1: b096bd4024431c81b7de3d0e8d1c6b3bd3fa6ec6 SHA-256: 2a4afc90e48cb73782c424edbf6abc5c91825b85f7a6e17d67bdb2f5aebb0e10
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body text is largely unreadable, but the presence of a URL related to 'ge microwave oven combo repair' suggests a lure to a potentially deceptive site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=ge+microwave+oven+combo+repair In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5ff6919b51573.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/jhfvzii/musica_italiana_anni_80_disco.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/djaeOjc/defomutipaji.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/rupavekujotirus-zubamuxomexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_6013956047211.pdfIn PDF document text
    • https://cdn.sqhk.co/fosigigamef/hgjd8LU/gepifuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_601a6d9ce9415.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/99541176271.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/fiaNjfV/86100184205.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/dotosaburemobi.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/bicXdia/falling_fred_ios.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/papeporev.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/4910f5379508f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_602d70f688de0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zejibanunepi.myartsonline.com/63939662924.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/the_planting_of_english_america_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/gemalemodizakalukesunuwer.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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 5192 bytes
SHA-256: f6cef8a05e2c2209e8b340945c9e089e9d2d93605d58f97dfaad2e7986e2f1c0
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 11032 bytes
SHA-256: d13b3c0206d47070cf0e4b891d8dda53257171ce57f3529655b37122fd7f5fe7

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