Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6505f1ffcbb823…

MALICIOUS

PDF

84.5 KB Created: 2020-11-24 21:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ab9fc1c7d5ab9f804947ae73d1018f2a SHA-1: ebcc629119ff3dfb74b4669b307b09c9c50a9831 SHA-256: be6505f1ffcbb8239687f6af9e2f31499014b71d225463520a7712732da55164
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to drive traffic to potentially harmful external resources.

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 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.
  • 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/strik?utm_term=willamette+weekly+voter+guide PDF link annotation
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/resinarumafepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5f9b877609a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5f971147077ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_5faeff1cca3ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_5f98dda907ba4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5f9207842ebb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5f933948ecd8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mejifavo/nenamewukosixadipa.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/lexonijipirabojutop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d2a3bd-40b8-43d7-817f-53315d729dea/faxawagakageninimetofipar.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/1192033966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c3880a-82ee-44ab-a052-5f16b9ca6bfe/ls-_magazine_torrent.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 5076 bytes
SHA-256: db2667af76c6e03158784e7fee78a25da3e9bf3b3c1eb86696961777d754f4ea
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 11544 bytes
SHA-256: 3ab54a320781e76b9dad7003daf99b53500c6bb0af87be3755f3aa884003c892
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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