Malicious PDF — malware analysis report

Static analysis result for SHA-256 43aef52046626207…

MALICIOUS

PDF

75.6 KB Created: 2021-03-01 22:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 845780bedf76f4434d5de47c247f0573 SHA-1: 0c1e586dde06548b968fd4c0b715a788c87d5817 SHA-256: 43aef52046626207a6499b8f68c741f7e0ad6fdda1b28160e1cd0d831ef5890b
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 manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=best+english+to+spanish+translation+online PDF link annotation
    • https://midatapeb.weebly.com/uploads/1/3/1/0/131070166/b0b15b18df.pdfIn PDF document text
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/75ea1e4cd47a8e.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/origami_heart_box_paper_kawaii.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/pumokutawigujururusip.pdfIn PDF document text
    • https://vorapitejure.weebly.com/uploads/1/3/4/6/134605364/425313.pdfIn PDF document text
    • https://melezejezoman.weebly.com/uploads/1/3/5/3/135383670/f4c93011.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/mediwor.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/Hjbo4hf/99836785174.pdfIn PDF document text
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/98689edd601f292.pdfIn PDF document text
    • https://ririsibonegibo.weebly.com/uploads/1/3/4/5/134596323/d9b15c1d9736fac.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/anfz08R/halloween_store_in_manhattan_ks_mall.pdfIn PDF document text
    • https://vatikaleme.weebly.com/uploads/1/3/5/3/135386674/2619f11226.pdfIn PDF document text
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/linar-vewaxinanezetom-tafetani-moram.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/for_my_legionaries_codreanu.pdfIn PDF document text
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/defd010d91060.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/YjgR3Hc/total_party_kill_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://figigibole.rf.gd/madugavirekewadozurilan.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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5128 bytes
SHA-256: 9a42a1060b05f909e0bc2eda712bca25b7e9af5229930489b232fa9cc0e8ca8c
font_01_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 11132 bytes
SHA-256: 8b312cbdf453aa83c59101ff686e90c36a17d31d794fa273c2604a1fa273e158

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