Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0436efb5ede2d7…

MALICIOUS

PDF

72.4 KB Created: 2021-03-21 07:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 746ae1817ec90064a339045790714ac2 SHA-1: 67ae346f85267df2327bbbc27d025bc7f3a188fd SHA-256: af0436efb5ede2d76350962cd1a31806b4f4bd0b18d33c0885366bf880f343bb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=formal+definition+of+carabiner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482413/normal_60395779b7727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5fcc3e1cb914b.pdfIn PDF document text
    • http://jushq.club/what_is_the_strongest_rope_for_pullingcvjz8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_6039f2ee8b037.pdfIn PDF document text
    • https://cdn.sqhk.co/liguzalat/MIgfJhf/bokeh_heat_map_template.pdfIn PDF document text
    • http://antileqphh.site/shashi_tharoor_book_inglorious_empire_downloadxpz4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_601586465e183.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/bhe2MWQ/fight_king_vendrick.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fcb60b8a2657.pdfIn PDF document text
    • http://bigwin-1xbet.fun/robakatazdnxg0.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/uIIjelI/space_drone_music.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/g86iaii/nudujukuwoxibek.pdfIn PDF document text
    • http://www19216801.site/fatosutawunajejinavisubi6x4h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_892a2150b3044a5483fb77feacfb1a13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/026d7c85-f40a-4492-958a-82af1af65add/did_they_close_everything_down_during_the_spanish_flu.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_3c335e3de114491da2ca36047fc669ca.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_5d8032e2ae034022a66b0b581a2d0a04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad7581f-c84d-4bb3-94bb-f954303000ae/ganoredufoboruranijexi.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_be94b2322cae4854b7b66bebcfd3415c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d14dd4b-a387-43d0-a75b-a390ba76b9e4/39801825959.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_aea3406adf354d11806314b2027129b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d5f377-4958-4004-99fb-abdaa1aa5b27/what_a_beautiful_family_quotes.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 5084 bytes
SHA-256: cfae2075d44d9c3ac7ca521aebdb0623f8fe04f771b67d0548178a8a4451238e
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10808 bytes
SHA-256: 0f07e6c37d9f87c880d3aa0b8fdd82e179981935c42c4fc7be604f5f0452f803

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