Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bf9b8d99eb296b…

MALICIOUS

PDF

80.3 KB Created: 2020-12-28 14:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 83929ae91ff2470c7e763bf6bbe196ef SHA-1: 200aed5d245078d995eb276813cb8039b2db5b4d SHA-256: 70bf9b8d99eb296ba70779b474b0b85b7769daa04099e1ec431783b2bc38dcf4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The presence of numerous external links, many pointing to unknown or potentially malicious domains, strongly indicates a phishing or scam attempt. The ML classifier and ClamAV also identified this file as malicious, supporting the assessment of a phishing campaign.

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
  • 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://cctraff.ru/123?utm_term=vcp6-dcv+delta+%25282v0-621d%2529+practice+exam In PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/7abc299904d.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/faxipulitafipej_delegusisamugu.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/fhbhgij/8588670837.pdfIn PDF document text
    • https://kivojiwivumupu.weebly.com/uploads/1/3/4/5/134597008/43f1920.pdfIn PDF document text
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/dizibuloxaka_gamife_navowunawid_rapojorapameg.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/9682311.pdfIn PDF document text
    • https://cdn.sqhk.co/merivexasug/Kia4Fft/1263521012.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/mexijegedakol/anker_portable_charger_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/sublime_format_json_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/bruce_leroy_sho_nuff.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/96547162164.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/sap_basis_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/99022795654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b9f1bc-fb98-4e81-8ec1-9a1318ab1246/lexujememegovo.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/electrical_lockout_tagout_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/android_auto_app_update_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 5800 bytes
SHA-256: ae7d90871d1481e18c65f8060be9d5dcbf4a5ed1f340e45e03903359efe2a00f
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 11644 bytes
SHA-256: 69fcb5350af0b06e464a9a27a95d9ad5a969e5a426642459020051428c501010

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