Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b70aa6c7c5a2c5…

MALICIOUS

PDF

89.9 KB Created: 2021-02-19 21:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 03270d0fef6d0daa2cb3672816f6845d SHA-1: 951410f4f6a53430fefd8d0160005b2fb9650091 SHA-256: b8b70aa6c7c5a2c5bd915102cd395d90bb58939a232f5b8698563e98d49ab485
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://jottigo.ru/wix?keyword=unblocked+games+ragdoll+avalanche PDF link annotation
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/7415587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fe91638ea2cb.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/geihhig/crash_cars_for_sale_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_600be539c8d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500199/normal_5ff0ce760b878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417652/normal_5ff19564bcfe8.pdfIn PDF document text
    • https://newimogo.weebly.com/uploads/1/3/1/0/131070302/wonazuwag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6029a6e701c66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fe6289f3a223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473892/normal_601a0030cb1f8.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/rujimidujek/84931575530.pdfIn PDF document text
    • http://jubuzixabes.rf.gd/arctic_word_search.pdfIn PDF document text
    • http://texokobatogu.epizy.com/network_topology_definition_and_types.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_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 5608 bytes
SHA-256: 3b3ebd2b7c38819d74552066fd6ba147759ca14a4d563ede395b1ecb2069cbbd
font_01_sfnt_off00013503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 11084 bytes
SHA-256: 014f6accd061c6792f74d74ec2cac36fecfc74b2a72af3dd297f7fe72a3797ea

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