Malicious PDF — malware analysis report

Static analysis result for SHA-256 f499e9f05f2fe87d…

MALICIOUS

PDF

71.4 KB Created: 2021-03-18 12:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2ada8c38718654f47c7bec255b6502e SHA-1: 2f2a15eb04db6ee6c2614adb0b4df187f4760529 SHA-256: f499e9f05f2fe87d89f0a24526c2555f0cf28538fc5d0c4cc4500d45c5b56d5c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, but the presence of URLs indicates an attempt to redirect the user to potentially malicious external sites.

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-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://dafemum.ru/123?utm_term=idsa+central+line+infection+guidelines
    • http://braco.ru/customer_service_policy_and_procedure_templatexrh4j.pdf
    • https://wifebazeb.weebly.com/uploads/1/3/1/4/131482826/demilekutobolo_juwefa_jusuripekiba.pdf
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/wubokololamu-vakulikaxe.pdf
    • http://kopalirigel.mypressonline.com/auxiliary_verbs_list.pdf
    • http://complect-tech.ru/pesezalepumalibanuqjygm.pdf
    • http://lolkek.xyz/wavefront_obj_models_freeys27x.pdf
    • https://sutofuwanunow.weebly.com/uploads/1/3/0/8/130874369/f6aebf29.pdf
    • https://lirikilufowu.weebly.com/uploads/1/3/1/0/131070293/fagovab.pdf
    • http://avto-trokot.xyz/dividing_fractions_worksheet_with_answers_tesqcd3v.pdf
    • http://axecheat1.xyz/heart_of_galaxy_wikicmiij.pdf
    • http://italia-doc.space/39038587182zn90p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_e7db805863ce474c86f3287b6c3128d3.pdf?index=true
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_22bc32aab3784fd1b0620f794883c83c.pdf?index=true
    • http://sajomapujozokux.onlinewebshop.net/how_to_use_the_black_and_decker_rice_cooker_plus.pdf
    • http://dogiwexor.myartsonline.com/fourier_analysis.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_off0000da9b.bin
d82503d7748ef9ecf9be5005737f96c1dd31ce01cd3f1cea23f3166587bbd093
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 5128 bytes
font_01_sfnt_off0000ec1a.bin
5340d02c120fcd5e45d142f70d71f5af6561a8293594eb794b7db9f6b7c6c923
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 10648 bytes