Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6bc6b87a43a9fe…

MALICIOUS

PDF

80.8 KB Created: 2021-04-01 17:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 001e0615afc124f886c9a78138fda7a7 SHA-1: a9eceaee3b2b6ebe464ab2e3c13656c811005aee SHA-256: 6b6bc6b87a43a9feb4cd90c12ea1db8af5154dee1167a8bae399bbef456b4482
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'link farm' heuristic, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=download+minecraft+for+pc+windows+10+free+2020
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fc8cef796fe0.pdf
    • http://lovewaits.ru/fibepilikovenozariza931y.pdf
    • http://freshnatur.fun/niteginepipexifibafujusipr2j1.pdf
    • https://cdn.sqhk.co/tijovomiv/irggBjf/popsugar_celebrity_quiz_look_alike.pdf
    • https://cdn.sqhk.co/vazoguzo/eFgXuij/hosen_group_ltd_annual_report_2016.pdf
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fe4c5c532b13.pdf
    • http://ens-pictures.ru/20914193096vo4ep.pdf
    • http://leqqurint.online/vintage_police_car_sirens_for_salehd3i0.pdf
    • https://cdn.sqhk.co/gusisitixinu/dijgfii/siren_sounds_fire_truck.pdf
    • https://cdn.sqhk.co/suxavawudomo/ejgjeje/free_steam_game_keys_no_survey.pdf
    • https://cdn.sqhk.co/lirebirab/ibQhgja/93783677189.pdf
    • https://cdn.sqhk.co/nogorodizet/jjrj6Qb/pencil_sharpener_with_plug.pdf
    • http://triple-doska6.club/293106285530tmsl.pdf
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fc77644732a3.pdf
    • http://wegansit.space/nakalibegobitazzywot.pdf
    • https://cdn.sqhk.co/kolokejo/cjdSja9/gas_properties_simulation_activity_answer_key.pdf
    • https://cdn.sqhk.co/lolajelor/bhcheCX/inoty_style_i_os13_apk.pdf
    • http://jushq.pro/dark_souls_2_best_magic_scaling_weapon1br5t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_399de22c23ae4f1b88adfadae065f2d2.pdf?index=true
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_cebc867bbf8f4f5d9e46d54c2e6319f5.pdf?index=true
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_1d9c43979cfd4731bcc13350f1bb737d.pdf?index=true
    • 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_off0000ff08.bin
581cc5d4b9d1cffce0bc5692fadd8e28556bb595a0c96f3564943a3fecd35670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 5716 bytes
font_01_sfnt_off0001128c.bin
090eed3256d2372d826d4ac3948f4b40cc23a758dc9a0fc759f8ee56a901a4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 10256 bytes

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