Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bb8f59c25231e0…

MALICIOUS

PDF

75.2 KB Created: 2021-04-18 07:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 57422bb6cfcdbc7d4a40d292576cab95 SHA-1: e4a594236ea2cc8f9fc29faa456220c17d9cedf1 SHA-256: f1bb8f59c25231e05ff95c8a5185a64a4a7d5a6aa5484ba494b24f303a857389
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 significant number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the PDF structure and embedded URLs 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://dafemum.ru/strik?utm_term=monopoly+auction+rules+starting+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426816/normal_602a6ed7375c1.pdfIn PDF document text
    • http://fazojum.66ghz.com/el_bautismo_cristiano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_6053623a12277.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/1a385d38-4afd-4d34-9ab9-d7232bad5714/xiresumedujigu.pdfIn PDF document text
    • http://bememikat.onlinewebshop.net/translation_french_to_english_file.pdfIn PDF document text
    • http://vatamutotomo.epizy.com/adidas_waist_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59b66e2-5f31-4750-8391-5d4659c01a22/vefubevitimegawipog.pdfIn PDF document text
    • http://vubibejibujala.rf.gd/elastic_collision_in_two_dimension_derivation.pdfIn PDF document text
    • http://jikelofov.rf.gd/microbiology_lab_techniques.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/19302892692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15ff1b2-6055-4eeb-9201-c95418e2568d/84051747289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a837ddac-2400-4628-a309-94e97b354e9e/xowinofan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b64a5d01-339b-4886-9d77-b97ac77e04d6/24052230302.pdfIn PDF document text
    • http://moxogojokerop.rf.gd/puberalaxexomo.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_e8c8bb8a87dd44cdb50317a7ff3623d9.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_f407b00654644c6483f7bf24f898d7fb.pdf?index=trueIn 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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 5208 bytes
SHA-256: 24fa667aa2fba0e5fbca8bca0a6e26971108aec63e78abd0a634c292ad7f4193
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 10716 bytes
SHA-256: adce72c01da2e15c37174805522e83fcd6492dd86b0153c64447d6c25236070b

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