Malicious PDF — malware analysis report

Static analysis result for SHA-256 3829ed281ff7074c…

MALICIOUS

PDF

69.3 KB Created: 2020-11-17 15:25:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0a92756785820f9e1c57f13f81a42fbb SHA-1: b681654b0b06fb6cc15a76535653b9ffa12a8e73 SHA-256: 3829ed281ff7074c07fc230427593b1d29c568f82b291f26d8ef3fe3ca7f1d33
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to 'trafftec.ru', suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware delivery attempt.

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://trafftec.ru/123?utm_term=little+cabin+in+the+woods+rental PDF link annotation
    • https://gabexilo.weebly.com/uploads/1/3/4/1/134109250/7197177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5fa9bd0658461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5fa6e12b441fb.pdfIn PDF document text
    • https://vabofofed.weebly.com/uploads/1/3/4/3/134337048/250202a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_5fab4eb6f2f3f.pdfIn PDF document text
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/b91fa5c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5fab297187753.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/d5428ef2.pdfIn PDF document text
    • https://jejabulalirolu.weebly.com/uploads/1/3/4/4/134464322/sowanamiwurapuxef.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/gadumagabusodel/league_of_legends_hyper_carry_list.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/jopoporelilipitovefazaxu.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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 5200 bytes
SHA-256: ef8096ec8f2d007b5f4098b8a012bda1cfcc48e13f27d4be5cadafeb8947a569
font_01_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 10548 bytes
SHA-256: 5aa2cf7d5f7e6e4b654599203a56a94fe45542faeb57544c7915744e65d24cbe

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