Malicious PDF — malware analysis report

Static analysis result for SHA-256 2719caad2fd8c67e…

MALICIOUS

PDF

68.6 KB Created: 2021-03-13 13:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ddd1bddd02398bf73912b13f4f477a6a SHA-1: b29925b519c0c72d6c65e60f4edb1cb79c3d17f8 SHA-256: 2719caad2fd8c67ed4a39f584e286145b022fcf2e0db8401d0f3c13cf947b75a
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 services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/award?keyword=alumina+processing+properties+and+applications+pdf PDF link annotation
    • http://sanegofelofut.22web.org/92146385865.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/046287e716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5fdae33c16b49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5feb265dcd8b1.pdfIn PDF document text
    • http://fefikaniki.22web.org/employee_verification_letter_template_free.pdfIn PDF document text
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/92d9f880643.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/1f31e88ba21186.pdfIn PDF document text
    • http://loxokunetuladi.66ghz.com/how_to_transfer_vinyl_stickers_cricut.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/sanexo-rafunij-devib-gixonagubivadi.pdfIn PDF document text
    • https://melitonewivowaw.weebly.com/uploads/1/3/1/3/131380875/51c93e508.pdfIn PDF document text
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/funegedudukozux-jafojuxuviwon-linuzopisal-jorawajewadifeg.pdfIn PDF document text
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/9238043.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kitijowu.rf.gd/wemigazonokaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8135da7d-d60e-4bab-a5c5-87e5f36d8fab/casio_g-shock_ga-1100-1a1dr_g815.pdfIn PDF document text
    • http://jatomije.rf.gd/gotranscript_quiz_answers.pdfIn PDF document text
    • http://tanamumejoxa.epizy.com/sat_practice_test_7_writing_and_language_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5e5d63-6718-4ac0-a08a-908d2944b8fa/67140655313.pdfIn PDF document text
    • http://gudavipupax.rf.gd/oracle_12c_database_security_best_practices.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_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 5464 bytes
SHA-256: 33b5e20a8fc73df04dfb5f634eae69aa7d524666c5c7d36b5f5bf543bb4c466c
font_01_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 10392 bytes
SHA-256: 4bdf21afa9ac9c2a8fb7c74b43274a7458bc379424b3912f9124e90b4aa41b8d

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