Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2e1d4592903418…

MALICIOUS

PDF

85.4 KB Created: 2021-05-18 15:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: accf4fbe3eaf86c75b5d7c2633307526 SHA-1: 237a7d310a951fb0fbe3b682bbd4bc27fd2a56c1 SHA-256: ac2e1d45929034181770c68550f75a7fa9a683cb1e2e7471c85dc638865eccdf
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm and a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is likely used to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=how+to+build+lean+muscle+workout+plan In PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/982ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_606017f48a007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462736/normal_5ff375d2eff24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_602b79b75f14b.pdfIn PDF document text
    • https://damasixo.weebly.com/uploads/1/3/5/3/135322107/6718619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_601a42390d786.pdfIn PDF document text
    • https://jamelowo.weebly.com/uploads/1/3/1/6/131606155/zetimumib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_6044218224a2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/523c3671-205e-43bb-9b0e-755cc18e36b3/11271665497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b44cf4-0370-4aa4-88ba-078869be5386/how_do_you_feel_when_your_iron_is_low_during_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/building_materials_and_construction_practices.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/29589621312.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/figujagam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be1acdc-5eed-45e1-a891-a85bc121e08b/81980903057.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/answers_for_loco_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8304e989-688d-498e-bd80-406d49a61321/does_frank_die_in_the_trials_of_apollo.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/lefifufikoredorirofibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a78ee0-7156-46ea-89b1-e44c47eb6af0/23760369251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f62d14-9644-4da1-9b29-53a07cda4477/nuxanore.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/flight_simulator_2020_release_date_xbox_one.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 5360 bytes
SHA-256: 2ee893337d4df2a70df8ce028d34b65cd9b2cb2bbe3d0ef7cd9b8d33d23982bf
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 11508 bytes
SHA-256: 8dcf84e8a41ea2f08fa75701eb83af3059d5b445a795418b83680067ac87a22f
font_02_sfnt_off00013a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A56 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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