Malicious PDF — malware analysis report

Static analysis result for SHA-256 76de9b2ee39730da…

MALICIOUS

PDF

78.7 KB Created: 2021-04-11 08:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3ff47f507208c86002024fda9e68498 SHA-1: 21bf358bf50088925cf50812372665991dc401e9 SHA-256: 76de9b2ee39730da67a319a736bdd6d1cda8f368fe0cbf6aefa3543bdf82d849
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, with one pointing to 'dafemum.ru', suggesting a phishing or malware distribution attempt. The PDF structure indicates it's part of a link farm, likely designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=financial+modelling+in+python+source+code
    • https://rakomuditopag.weebly.com/uploads/1/3/4/7/134717505/0d123951.pdf
    • http://istra-backwater.ru/identidades_trigonomtricas_ejercicios_resueltos_1_bachillerato4djep.pdf
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/lizezufu-dunolugatuwika.pdf
    • http://salonop.xyz/how_to_install_evenflo_sonus_65_convertible_car_seat9suaf.pdf
    • https://xopubuniwanofu.weebly.com/uploads/1/3/4/1/134131716/sozenirere_gekuki_wogobugus_bijadudojus.pdf
    • http://onlinetyz.xyz/52627019373damx9.pdf
    • https://cdn-cms.f-static.net/uploads/4485823/normal_605277ddc6a16.pdf
    • http://m-laskin.ru/lolupo5cetg.pdf
    • http://segway-wheelchair.ru/tujiwetulonugomo7w6.pdf
    • http://moscowflowers.shop/wizedanasebasarovirebobi5j9r.pdf
    • https://cdn-cms.f-static.net/uploads/4406812/normal_602ded81af4cd.pdf
    • https://wixewolo.weebly.com/uploads/1/3/4/5/134577565/2460377.pdf
    • https://static.s123-cdn-static.com/uploads/4393193/normal_5ffd72ea76190.pdf
    • http://cashbackmoney.info/hidden_bonfire_stories_faceless_gravediggerzm8qz.pdf
    • https://static.s123-cdn-static.com/uploads/4473618/normal_5feb71e5b1f5c.pdf
    • http://bigswinner.space/tofugebezujexikozumul2m4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/najubu/10401247355.pdf
    • https://s3.amazonaws.com/pokorevalaxex/16249693492.pdf
    • https://s3.amazonaws.com/bupaxomu/dunkin_donuts_stock_graph.pdf
    • https://s3.amazonaws.com/gajakelegeza/84671291927.pdf
    • https://s3.amazonaws.com/zuwosil/the_100_season_4_episode_recap.pdf
    • https://s3.amazonaws.com/zidenigad/31239242782.pdf
    • https://s3.amazonaws.com/davubewu/free_fire_diamond_generator_app.pdf
    • https://s3.amazonaws.com/jeworurowam/54545767901.pdf
    • 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_off0000f569.bin
bb0e19891ae21b2a9093d3da6f1bb7be0bdf021e0f821828c829db081c921dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 5544 bytes
font_01_sfnt_off00010821.bin
5fa2019c06d866c91f607b862d5780f6bde4f548ffc705b6d67f99fd781235f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 10756 bytes

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