Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf447b3b92d1169a…

MALICIOUS

PDF

167.3 KB Created: 2021-03-24 15:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d31c7f2b134ceb288caf9b981d83beb2 SHA-1: 98dc5dcb83ff0979019000ebf4e338545a7c1ac6 SHA-256: bf447b3b92d1169a190e4f6237822a0d647c3e32a5f626b2ec2ca303d1a8a748
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains and utilizing UTM parameters, strongly suggests a phishing or link-farming campaign. The ML classifier also indicated a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=the+endless+trench+film+review+guardian PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402707/normal_604f7cf004a22.pdfIn PDF document text
    • http://jnatural.space/the_accidental_superpowerqz9cd.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/what_specific_techniques_are_used_in_the_cognitive_behaviour_therapy_cbt_approach.pdfIn PDF document text
    • http://roduvogixaxo.66ghz.com/authorization_format_header.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/62941516426.pdfIn PDF document text
    • http://molopew.22web.org/ditonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_6010fa29d0806.pdfIn PDF document text
    • http://kupivse.xyz/minajuxereluweq5rt1.pdfIn PDF document text
    • http://jeweboz.iblogger.org/werovuju.pdfIn PDF document text
    • http://trylait.pro/bamubavefaduwsy78.pdfIn PDF document text
    • http://wamabivunufoteg.medianewsonline.com/payback_period_problems_and_solutions.pdfIn PDF document text
    • http://jewlgems.com/bloons_tower_defence_5_free_iosklz09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_7cd70974f79b48edaae8ed30cee985b3.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_b195de5a93a44148b16ef5355911b4fa.pdf?index=trueIn PDF document text
    • http://ramexizopu.rf.gd/inspirational_quotes_thich_nhat_hanh.pdfIn PDF document text
    • http://nalejunubotuw.rf.gd/88510803393.pdfIn PDF document text
    • http://lesidiwajenowil.myartsonline.com/ramas_terminales_de_la_carotida_externa.pdfIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_33a7ba55fd93430c81049841c3af98b6.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_bd97c2043dba43c89bc1c05e983109aa.pdf?index=trueIn PDF document text
    • http://sajetubaj.epizy.com/63846648034.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_off00024ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BA2 5536 bytes
SHA-256: e9254019bd6c2341b66794cadc86dfd33e67c402598e3abb3bf48ba319265c52
font_01_sfnt_off00025e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E61 16580 bytes
SHA-256: 6faa9504b23f7ffc2c70460714d911d72d20c32a35d4d4818072f8f6206003b1

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