Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba5801b0b58c9ab…

MALICIOUS

PDF

68.8 KB Created: 2020-12-03 05:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0173ab52b5ead137c592cc8a99fd99fe SHA-1: bb9a35c0c093fdfade445814af877b7252b2c675 SHA-256: 9ba5801b0b58c9ab242d2a71759181cc891be3ca3edafba30e0a656aba85f59c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://traffmen.ru/strik?utm_term=trail+rite+boat+trailer+weight'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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=trail+rite+boat+trailer+weight In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5fc1c298b6585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_5fb9c8c5b7c1b.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/kinojupebul-fofedonabilu-tudaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f928ba44fab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f888f222986e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fc2bdd7b7360.pdfIn PDF document text
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/fafegiseti_roxedapika_kubinodufodenaf_ladole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5f9e0db32a9c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8be00e65360.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/fowikorejodi/ramewifeneferelasepe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f79e2e34347c7044618a/t/5fc40a93f81c9a2a0c1ffb90/1606683283338/multi_step_trig_word_problems_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/15997626465.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/alaye_sitralaye_song_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/software_hazop_guide_words.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/android_one_upcoming_phones_in_india.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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 4948 bytes
SHA-256: 74898f5d92132333d233a66306b83e07180e219801ae119f21b9010fa23de241
font_01_sfnt_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 11140 bytes
SHA-256: b9218ae06d5b09ef5927e10223950365683c93c9c512da10602570f1c48bea2c

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