Malicious PDF — malware analysis report

Static analysis result for SHA-256 afff9c2e3c8f84f8…

MALICIOUS

PDF

85.3 KB Created: 2021-03-20 09:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5212df087933c21b86aa83f309f245e1 SHA-1: f21cba0ee9474fca1c471385a261c1d5c724d1fc SHA-256: afff9c2e3c8f84f8dde424f2e43c3a9d8eea2d568060d690366a839e01086a0d
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://crophysi.ru/award?keyword=solving+non+homogeneous+differential+equations+pdf`. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=solving+non+homogeneous+differential+equations+pdf In PDF document text
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/1523786.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/bGzM8gf/62254318380.pdfIn PDF document text
    • http://yachts-4-sale.com/what_are_the_5_elements_of_musicjfan8.pdfIn PDF document text
    • http://meinekarten.best/how_to_raise_your_salary_by_napoleon_hill54s53.pdfIn PDF document text
    • http://fimewot.xyz/padi_open_water_certification_tulum8phx2.pdfIn PDF document text
    • http://kersita.fun/how_much_is_premiere_pro_a_yearl1fn7.pdfIn PDF document text
    • https://rikisefunem.weebly.com/uploads/1/3/5/3/135337995/181c6.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/hgigjnj/entergy_madison_ms_phone_number.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/tonemakopinibem/jubimogaxexudufujuv.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_2b7bc6cfa78f4a4dae4f13da84aa13be.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_52fd81b1042d4045b430ae6044a0815f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuzo/rexasofawuninupiderig.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_7f5b01174cc44ca1aa890ccd104e846c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/rabukevuzubetuditomikuwuf.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_9735834c5551437cb378c60cfdcd0da2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisik/30167237150.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/all_star_sports_resort_map.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_74bc7e0a72024a7990709064addda76f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/fannie_mae_guidelines_on_custodial_accounts.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/46273785787.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_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 5744 bytes
SHA-256: ed00f8b3452fbb6c9f0ceda9dab0853fe13d762897add19293b92e542205c346
font_01_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 11504 bytes
SHA-256: 1d5b35056c67c2d1900defd43432203915a0617f809227e40b741aa32ce47640

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