Malicious PDF — malware analysis report

Static analysis result for SHA-256 b732a2889ab8a990…

MALICIOUS

PDF

73.1 KB Created: 2021-03-29 17:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 02a54771374d94b070315796845e3cd0 SHA-1: 8661b1554e1a9a9290fd2a52c939f924b6cf80c3 SHA-256: b732a2889ab8a990eef3acf0d783dc377d95ef15d847955e412d0841ffa3a9e7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or link farms, suggesting a phishing or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://kuzutuzo.ru/award?keyword=financial+accounting+ratios+pdf PDF link annotation
    • https://cdn.sqhk.co/vovigewuva/UlKSjjQ/maintenance_job_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/pjbD3jj/mumudejosuk.pdfIn PDF document text
    • https://pigokujedaxe.weebly.com/uploads/1/3/0/7/130740563/rirasuluva_faziripemag_mowivemapidutok_digulegerupef.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/easiest_way_to_learn_autocad_electrical.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/uO2igLs/willie_nelson_16_biggest_hits_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/hfFibja/66069434796.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujagemo/jt7FijV/windows_media_player_free_softonic.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/rufosid-bivigoguka.pdfIn PDF document text
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/5145008.pdfIn PDF document text
    • https://jetujipizi.weebly.com/uploads/1/3/0/8/130813705/6944817.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/Vhejdwv/15150957526.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/g54PUHP/69861538182.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lixanixuzuki.rf.gd/gudorutugovobasuxi.pdfIn PDF document text
    • http://zevideto.rf.gd/makukulaxekaratefivufawuz.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/22548200782.pdfIn PDF document text
    • http://kusegipe.epizy.com/24801839083.pdfIn PDF document text
    • http://xeregolipota.epizy.com/2578536139.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/bixubanedafanulikeka.pdfIn PDF document text
    • http://mogerokefo.epizy.com/ligavuvezufawiwufugu.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 5276 bytes
SHA-256: ed5811c077a214566650e2c873edf200d508147a552ac132b9bc06683e4c48b8
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 10404 bytes
SHA-256: 29b4389981c04cef9299d80b43a93464174547483ad5830cc1726184d947b785

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