Malicious PDF — malware analysis report

Static analysis result for SHA-256 8530d20ab94d9c6f…

MALICIOUS

PDF

72.2 KB Created: 2021-03-09 20:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 58ec2b8a0ae011656ad3983b1a7f1d0d SHA-1: c9bffa02007a71aa9b6335e85cb9b5f2ef4815dc SHA-256: 8530d20ab94d9c6f92845bd6822c8dababb3f8340c5e846a211be5b5a502afc0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to 'chain of custody computer forensics form' to trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=chain+of+custody+computer+forensics+form PDF link annotation
    • http://soribowunalosu.22web.org/incident_report_letter_samples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_600fb6c6055ed.pdfIn PDF document text
    • http://nubolats.xyz/d5200_vs_d5300fpruz.pdfIn PDF document text
    • http://guitar.su/how_to_use_bosch_300_series_dryerlearc.pdfIn PDF document text
    • http://uabiomanix.xyz/nissan_50_forklift_partskdtqf.pdfIn PDF document text
    • http://maturibcgj.space/reactive_form_dirty_pristinehsfdd.pdfIn PDF document text
    • http://itslm.fun/74450018339ip5oz.pdfIn PDF document text
    • http://vanlit.ru/vascular_surgery_books_freelcyc5.pdfIn PDF document text
    • http://masajsalonunuz.com/panasonic_6.0_plus_kx-tg4731asg3l.pdfIn PDF document text
    • http://zoosalon.org/44921162845po51j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_603e7fcf72a05.pdfIn PDF document text
    • http://8gusevshop.website/arthrosis_deformans_kaakjous2.pdfIn PDF document text
    • http://honey-love.ru/71771013189ui69n.pdfIn PDF document text
    • http://criticcxck.space/english_grammar_worksheets_for_grade_121ff3q.pdfIn PDF document text
    • http://goodsfor.life/45143160867koqej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_6002d6ee1f1f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewipurorafe.epizy.com/sharepoint_user_guide.pdfIn PDF document text
    • http://dorowoz.rf.gd/aluminium_sheet_metal_wickes.pdfIn PDF document text
    • http://fusuxitizubuka.epizy.com/sbi_junior_associate_exam_syllabus_2019.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/zunijedabebu.pdfIn PDF document text
    • http://zesivigodexewig.epizy.com/75361680288.pdfIn PDF document text
    • http://voferinokubusob.rf.gd/kandungan_ampas_kelapa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 5368 bytes
SHA-256: 7eac527d498f55f14b558e5045e97dabaddcde6f7d822fe5a5a2db506101f120
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10392 bytes
SHA-256: 39eddd2f77781a64590c3765d340eab1dbb7dbecca386c94ed79e1b6dd66cc60

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