Malicious PDF — malware analysis report

Static analysis result for SHA-256 073d08429a65c6c8…

MALICIOUS

PDF

85.1 KB Created: 2021-05-28 10:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b401c5ff6a5fab9f263927803cc15d74 SHA-1: d721695f435f41d76105a1b202f11de04568b477 SHA-256: 073d08429a65c6c861a857a3ef0a0c767954c60a239e94321be2f27a24784eaf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=the+selection+series+the+crown+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6027b88f195a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447464/normal_5fceeee29f751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fee9c62c2164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5fd5f49d04688.pdfIn PDF document text
    • https://pefolasonej.weebly.com/uploads/1/3/4/9/134901659/8523512.pdfIn PDF document text
    • https://pibazafefudo.weebly.com/uploads/1/3/0/7/130776509/xizinotejinu_nufedis_gesurofixadof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449399/normal_5fe1d4991c20e.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/84a9180f5.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/6484043.pdfIn PDF document text
    • https://bululuxoragoxoj.weebly.com/uploads/1/3/0/9/130969030/6199245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fdf48b26b026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_6052847eedc05.pdfIn PDF document text
    • https://xukejexen.weebly.com/uploads/1/3/4/4/134480318/b4e61e441721c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5ffd8147c8d40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ad60db-9069-4d91-819a-f127a314755d/ejemplos_de_funciones_logicas_anidadas_en_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0757bad-a8ca-4b7e-8ffa-7c9551c39393/13861105905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3dd12f-1145-4d90-ae12-2b571c105f13/schlage_touch_keyless_electronic_lock_with_gripset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a580b68-d7dd-41b4-bf53-ff74344ab13d/intermediate_english_grammar_in_use_supplementary_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3da08f-e08f-4571-a379-06e6f594e46f/quadrafire_800_pellet_stove_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0d4ffa-3556-420e-9f6b-62f186e97dfb/why_is_my_fan_oven_not_getting_hot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3188ad5-6b9a-43fb-8212-7d2f412e6549/what_is_thermal_controller_alienware.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_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 4928 bytes
SHA-256: e650bc3a3c9673190af07ccf8d2465e09c2a663fec630b5ea229b22eb1eabb0f
font_01_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 11140 bytes
SHA-256: c93099dea1baf914429ad40bca01de41095b4e15e467dbbe853b33d4dfd9ecb6