Malicious PDF — malware analysis report

Static analysis result for SHA-256 64797d3aa1c7dc5e…

MALICIOUS

PDF

70.1 KB Created: 2020-11-25 20:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 083938284ef900d82c0cebb54ef76ba4 SHA-1: db6f93588b9b99098dc9e59cd5effd3e3c378833 SHA-256: 64797d3aa1c7dc5e4f71df1394f53bfbc8aa51e38443b49941f0a97bfb985cbe
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://traffmen.ru/strik?utm_term=should+trees+have+standing+analysis'. This, combined with a high ML classifier score and ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffmen.ru/strik?utm_term=should+trees+have+standing+analysis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f895a6cf0bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f91f92ab2768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5f8e1ebd8d950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8e84576af64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f9137a89d49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_5fa69d10ed7f7.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/digigitusuduk/xuzetolipetiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bff9d80-af04-4995-b39f-7f7b1533df40/market_the_price_of_gold.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/aashto_manual_for_assessing_safety_hardware_mash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9075e4a-a467-44e8-a4ff-83239e8cb380/simomizozegaziwozonuwub.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/gideruzeze.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/ap_computer_science_principles_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ba949a-d743-428e-8f0e-b25c99cee91d/tizoruxotep.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/tesukunumevelatamulokus.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_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 5352 bytes
SHA-256: cf3415d828f9d4f2e4c18d49ae474cbfd43100dece0544d1fd1532adc216c591
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 10316 bytes
SHA-256: 3fdaf0ecd6d942bf7414e5e4a3e93817fea644e4df9a5d7e5c1b3794344ac670

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