Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f9cb499ffd0368…

MALICIOUS

PDF

74.7 KB Created: 2021-04-30 11:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 28186d1874be476402d2ec64a6d16905 SHA-1: 1074d6f9a65d28072ba2f65ada36bfb9e6a29074 SHA-256: 43f9cb499ffd03687601aa60f2a4e5c49d67fdf3968f21e5cfb603c4ffa15821
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful content.

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://xezojetit.ru/strik?utm_term=how+to+change+the+head+on+a+stihl+fs+56+rc+weed+eater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494166/normal_60367204e3a50.pdfIn PDF document text
    • http://maslovauto.ru/essential_speaking_skills_joanna_bakeriqn78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_6016e097481a1.pdfIn PDF document text
    • http://itfamily.pro/10061154721a4fal.pdfIn PDF document text
    • https://cdn.sqhk.co/gubalugotu/npjf1hd/51461191769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_60562d751de24.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/X2tpijg/75292509094.pdfIn PDF document text
    • https://dekimipuxaz.weebly.com/uploads/1/3/4/0/134016680/wuwet.pdfIn PDF document text
    • http://sale20.site/nufigomodowukalcdrgk.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/Qgji7nc/67007449414.pdfIn PDF document text
    • http://about-central.com/kurologobajf5p7.pdfIn PDF document text
    • http://fuckfrsky.com/how_many_calories_in_a_medium_coffee_with_cream_and_sugar_from_dunkin_donutso4mge.pdfIn PDF document text
    • https://vozabamoz.weebly.com/uploads/1/3/5/9/135959881/tevivotigijutaw-zizon.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/7447818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kimone/guideline_variation_classification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4aff059-0845-40a9-9ec5-4ad468bc45f9/wuwobukobas.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/zomifuzifetabovakenivol.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/raradavabi.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/39118461463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b900fd2-9186-40b6-a86d-5afa1ec8a52b/76949756911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac31bcd-85fc-4476-9624-01305be86bd9/79456587774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90711edf-2fad-4efa-8ee0-19ffe882a23d/crossbow_plans_pattern.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_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 5616 bytes
SHA-256: 34e6377e464d5c4eeae28ed5080a14a178808fc23055cc7994ff6080dd8eceae
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 11548 bytes
SHA-256: 67086603bb3b08acd90a6bd779efb69fc8fd4a3a437c7b7865351498159e70ec

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