Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46f16a494017552…

MALICIOUS

PDF

70.6 KB Created: 2021-01-01 00:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 93a5b9a1371ff1867ea147aac7ae3d35 SHA-1: 728d7cd9f8d483937a4cc2b8473e6db402c334fd SHA-256: a46f16a494017552b9324cfcc96fe504f585c82f33c17f38808196cd27c1d72c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the PDF contains a large number of external links, suggesting it functions as a link farm. The embedded URLs point to various domains, many hosted on disposable platforms like Weebly, which are commonly used for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafffe.ru/123?utm_term=tok+presentation+examples+topics PDF link annotation
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/jisazunuwirubit.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/gciUvjh/65384733985.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://zedawaven.weebly.com/uploads/1/3/4/6/134634651/gurudomulobexur-wewexewajutukes.pdfIn PDF document text
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/sumupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_5fb290e257c33.pdfIn PDF document text
    • https://cdn.sqhk.co/pemanunid/HF9WGja/57233032882.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/4c2cb17da89382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/649a8299-8c52-4a36-a64a-e1ddab55720d/khmer_thai_movies_2019_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2674da1-0c1b-4785-bbbb-97f5fec15cd5/bifezisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158a78ea-010b-40e4-b113-1cf869852d9c/69350353424.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 5160 bytes
SHA-256: 35b047a7d3c570c832e0b59e154042f76d0956486a598460ef72c75875a92ab6
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 10408 bytes
SHA-256: bee66eef82d148df2b1465e3432ebcd76af68857c4a01e9fe49eab727f727553

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