Malicious PDF — malware analysis report

Static analysis result for SHA-256 02874766463b1792…

MALICIOUS

PDF

86.1 KB Created: 2021-03-27 15:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7075f67cb72fe1d3131ccb300363ea11 SHA-1: 1aa737684745d4509f3a905b80b37e5f946960e0 SHA-256: 02874766463b1792e04f1ce7cc64749ce410f0dd1def113f8439df621ea0b308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted content. The embedded URLs suggest a strategy to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=gentamicin+induced+nephrotoxicity+pdf
    • http://nubolats.xyz/pride_and_prejudice_online_movie_2005sb0f5.pdf
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/342970.pdf
    • https://cdn.sqhk.co/kupuruvew/5mjiDjb/war_of_1812_president.pdf
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601e1bfa16f2f.pdf
    • https://jaduxokapatusiw.weebly.com/uploads/1/3/5/3/135301375/f01ae215d81.pdf
    • https://cdn-cms.f-static.net/uploads/4375541/normal_6047e36070ca2.pdf
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/5417618.pdf
    • https://cdn-cms.f-static.net/uploads/4459166/normal_60145efc86a09.pdf
    • http://idealica-co.site/dezinonoguzidurizabewiz9vapa.pdf
    • https://cdn-cms.f-static.net/uploads/4465564/normal_5fd309d785b3b.pdf
    • https://cdn.sqhk.co/ximepadogi/iejdlid/play_store_app_for_galaxy_s2.pdf
    • https://cdn-cms.f-static.net/uploads/4481994/normal_60458202be277.pdf
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fe1fe48e77f5.pdf
    • https://pilorixo.weebly.com/uploads/1/3/4/6/134689004/burukewagobike.pdf
    • https://cdn.sqhk.co/xovikojux/kNHeOib/92744469617.pdf
    • https://negowisavu.weebly.com/uploads/1/3/1/4/131406226/zorupobore.pdf
    • http://nebo-baikala.ru/hamlet_coloring_book_pages6psc1.pdf
    • https://cdn-cms.f-static.net/uploads/4466366/normal_5fd8f546da3e0.pdf
    • http://lnstagramverifycentre.com/welenil9cldh.pdf
    • https://cdn.sqhk.co/waxigapo/jhjekgf/smash_up_derby_cars_for_sale.pdf
    • https://tewiwumorivare.weebly.com/uploads/1/3/1/4/131409909/derubigifemizomu.pdf
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/1043490.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f4f.bin
14099510515e9b64b597862d231289b629c50529ee6ad2b47907fb3d8a3d2996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 5388 bytes
font_01_sfnt_off0001218a.bin
11eaad1fb150163503321984e5a491915a574b6a580fbd3321f10219c22689d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 11980 bytes

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