Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe863a87f57f993…

MALICIOUS

PDF

65.5 KB Created: 2021-01-11 13:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: af8a2134ddeda48160baf1dff7a12d77 SHA-1: 039b67159ea66985ef6a9227e04c65edf2c62ab7 SHA-256: abe863a87f57f993d00322869580cd62c0eb22c2ebc4a1d62394cde2cdeabdda
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the embedded URLs point towards a common tactic of using documents as a lure to external resources.

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
  • 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://traffset.ru/123?utm_term=red+ipod+touch+7 PDF link annotation
    • https://jisixeda.weebly.com/uploads/1/3/1/4/131409884/1564057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_5fb990755b99d.pdfIn PDF document text
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/pemixak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fd0bbce6dcae.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/5044965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_5fbb919c77b2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_5f9e5195b69e9.pdfIn PDF document text
    • https://site-1168463.mozfiles.com/files/1168463/virtual_barber_shop_haircut_3d_sound_mp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_5fe82ada8a6e8.pdfIn PDF document text
    • https://site-1176154.mozfiles.com/files/1176154/necromancer_eso_skills.pdfIn PDF document text
    • https://site-1172011.mozfiles.com/files/1172011/vr_home_tour_software_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5fcc73f33e44a.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/legenapi/aaawwubbis_words_complex_sentences.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_off0000c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 4732 bytes
SHA-256: b456f2879062da67b16b59030b5545793919eeb3530d57565a615d9f4b5c508b
font_01_sfnt_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 10648 bytes
SHA-256: 529137b9ba92ecddd7649a6c6d1834bc3eabb13c22d6bb6ab9775cdf54addf11

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