Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf42c2b2a181b04f…

MALICIOUS

PDF

82.9 KB Created: 2021-05-03 01:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 643d931860907a3b4377ec1057066c62 SHA-1: 8b960d7d33f7c9c169fccb9745f94d8da5cb7556 SHA-256: cf42c2b2a181b04f470cefc77f736fccd1bc6e728885fad447c1681a0bad065d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://fokemale.ru/strik?utm_term=what+are+the+best+nespresso+vertuoline+capsules PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5ffbbe7394c93.pdfIn PDF document text
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/parupinakigo-fodupigewasi-gunibiva-jemomi.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/jgTqdgf/40845740326.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/ifJOdAZ/tewukalakaxururomoxu.pdfIn PDF document text
    • https://nijikubu.weebly.com/uploads/1/3/5/3/135347783/lanew.pdfIn PDF document text
    • http://jefozogez.66ghz.com/44951784789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5fc6d35da9086.pdfIn PDF document text
    • http://lakewereveg.iblogger.org/26341524558.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/fuseralabegilug.pdfIn PDF document text
    • https://fenibelamej.weebly.com/uploads/1/3/4/4/134464240/3aafc521ef47f3b.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/wihfW4J/rifurumesiwa.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/nakevoja/94309409514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637ab8bc-80c5-4c58-ab6c-970809293171/how_can_i_be_a_good_intercessor.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/beneath_a_steel_sky_ita.pdfIn PDF document text
    • http://baxamudixilado.rf.gd/ralph_waldo_emerson_poems_book.pdfIn PDF document text
    • http://ninufajo.epizy.com/anger_management_a_cognitive_behavioral_therapy_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1c7307-2889-4d68-a005-1d557f060475/wiring_simplified_45th_edition_diy_electrical_installation_guide.pdfIn PDF document text
    • http://gesovupa.epizy.com/honshu_city_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/jegumanuvavujip.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_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 5232 bytes
SHA-256: 8373ed05074d8ffcf08bf2df984ac3d6a0135841411d89ba02f046e41f6cc64c
font_01_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 10184 bytes
SHA-256: 0b871447b7b6ae71a0227d47210f0ee71dd2921df4ef5ca4b40cdf1a26a4e580

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