Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a63294e15b5bd4…

MALICIOUS

PDF

67.4 KB Created: 2021-01-19 14:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: e9c4eaf736be8b598d9c2a22f2c11b56 SHA-1: b30e401a45b9493a5a37ad477cb43b21ec8aa89e SHA-256: c4a63294e15b5bd4f3f7062428ed581df58523489d2b088b6434314c183b36b5
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://crophysi.ru/wb?keyword=art%20station%20low%20poly%203d In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fbcfbeb94edd.pdfIn PDF document text
    • https://gaxasonazeg.weebly.com/uploads/1/3/4/3/134375181/zadex.pdfIn PDF document text
    • https://mirotipobidonep.weebly.com/uploads/1/3/4/9/134902528/kilavezumanan_wekisixidor_kemivanukilukow.pdfIn PDF document text
    • https://xulomonixibeneg.weebly.com/uploads/1/3/1/4/131455416/3544790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_5fe69a7ba51b3.pdfIn PDF document text
    • https://site-1173237.mozfiles.com/files/1173237/stickman_fighter_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/9Yjehdh/shadow_fight_2_titan_mod_no_root_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/0vijjfG/bujanesegovodigulas.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/9cgmNOA/meteor_storm_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/eKIhdfs/97776116490.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/8qFhihj/2706_retro_arcade_machine_console.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f983cc96d5c9.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/aHihiS4/digidesign_192_analog_input_card.pdfIn PDF document text
    • https://site-1173608.mozfiles.com/files/1173608/slack_download_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruzojonawa.epizy.com/maxalegogabaganulejafole.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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 5300 bytes
SHA-256: 25227210c55b0c90f1b0174235c40e243aa208e632afd9bebe4e186e1ab0935b
font_01_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 9984 bytes
SHA-256: 34a05134236f5208fd9a3e3daa145bc7ead846aa4a43ea1edad731684fa04a74

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