Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca2da8992dd2e8f…

MALICIOUS

PDF

71.8 KB Created: 2021-03-04 03:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 871aece5de3691fb6f06ae9e65e002b1 SHA-1: 66e7224304c6e026ce03a159ec4d14a2f2c31a53 SHA-256: aca2da8992dd2e8f07adb00b13d83b1845fbcde74f240884a094b4c18659a301
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to host a large number of links on low-reputation domains.

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/wb?keyword=codename%20villanelle%20pdf%20francais PDF link annotation
    • http://stavki.link/wuwudiwqy15i.pdfIn PDF document text
    • http://nujatofu.22web.org/online_graphic_design_courses_with_certificates_south_africa.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/fevogolepobanakisufbln2.pdfIn PDF document text
    • http://copyrightviolationcenters.com/riders_in_the_sky_1949zej50.pdfIn PDF document text
    • http://jobs-ingenieur.best/4904814287221mc.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/wizards_and_warriors_pc_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/shiumif/47969969278.pdfIn PDF document text
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/1822367.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/495505551208238h.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/e2e4433d.pdfIn PDF document text
    • http://toppiksnack.xyz/how_to_write_a_paper_introduction_body_conclusionxnlam.pdfIn PDF document text
    • http://italia-doc.space/yamaha_01v96i_manual2psmw.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/hd3ghjg/95392250117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafafogaditeki.rf.gd/what_does_call_to_action_mean_in_an_argumentative_essay.pdfIn PDF document text
    • http://forivilipakeb.epizy.com/jurav.pdfIn PDF document text
    • http://momugegunimex.rf.gd/tubifokufovuriwevovidof.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/interpreting_topographic_maps_worksheet_answer_key.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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 5264 bytes
SHA-256: b53bb7f03560cf013df298a5d8b030870f26f42b974c7fcc9c7d085893c7e95a
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 11872 bytes
SHA-256: aaac0ea305c3cc5a9498603f29d9962d19a970b7a3c8d1fdf87f9f363861d426

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