Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e77cce9faee2d2…

MALICIOUS

PDF

60.7 KB Created: 2020-12-20 09:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: be645dee376c5e46cc134d3b5889140f SHA-1: 12ebf69833c3dc8fb7ff206f6366f32a80fa97b9 SHA-256: a9e77cce9faee2d2f931ef64407f2ce55849b5f6df195f5613d55d54ea5cfb9b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic identifying one as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous links suggests a phishing or content-luring attack, likely delivered as a spearphishing attachment.

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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=disney+infinity+xbox+360+gamestop In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_5faaf80b36c44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_5f9421da2bed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5faa75a4232cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5f9b9bb2205c5.pdfIn PDF document text
    • https://tuzisufuga.weebly.com/uploads/1/3/4/4/134458332/1a10c9.pdfIn PDF document text
    • https://kiwemedorupa.weebly.com/uploads/1/3/4/4/134446537/90424073f93bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc531fa405d5340f345b286/t/5fd67eda034a586a4f485b92/1607892714788/kodiwuzafizewawovedufigis.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/50211759855.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdee704a55824081a4b343/t/5fd132eafefdeb2428b083cd/1607545579604/7767658415.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce4445ea95a9497c0605ef/t/5fd1b273871f8c6e595a926e/1607578228411/clash_royale_decks_arena_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2da1e86-85b9-4329-890e-7c2305db67f4/nubuxuwozugupideketixe.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/free_the_avengers_movie_online.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_off0000b0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C6 5864 bytes
SHA-256: 884ad8f72da5153ee16f4a322ba8081586466278123261207758be746a67197c
font_01_sfnt_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 9796 bytes
SHA-256: 6c65fdb9c59dec759547178e3f4549d8011a5c3b14120c5193b73b1c5ce9f4f4

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