Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d12d4ced95ba0b…

MALICIOUS

PDF

86.7 KB Created: 2021-05-19 14:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4379d0495fa8575979b54eebff6ca35f SHA-1: 221f35a06649bc96d25e67295b556a93bf4a7eb7 SHA-256: 03d12d4ced95ba0bf093c55695b95622a031164ee00cecbee7e71673035dc378
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Stalag 9c prisoner list' and 'wkhtmltopdf', which appear to be lures to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=stalag+9c+prisoner+list PDF link annotation
    • https://fulotagefopag.weebly.com/uploads/1/3/1/8/131857199/3658419.pdfIn PDF document text
    • https://funemozivadomuz.weebly.com/uploads/1/3/1/3/131398429/3309157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_60327eb73825b.pdfIn PDF document text
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/dbaaa9edcdff7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488569/normal_5fe5129e95273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446635/normal_5ff26f15c03ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_601473f975dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd1bbc6a6a9b.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/0527e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_606766831c97c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455670/normal_6057a3613522a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_600078fa9b0b5.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/dediv-dinapedalojatu-ruxigevatirener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_603a920b5f2b0.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/531ec08c-4994-4f4d-a619-ca55f72fd30c/the_elephant_man_full_movie_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2567dc-168c-4594-b1b1-50152e91c11b/63903545188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58dcfe5e-1347-45ed-ac6f-690a5995dc2a/spelling_power_lesson_3_double_consonants_grade_8_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19445b4c-afe4-4cdd-9e61-3415078c2152/14032006174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0ef69d-35fa-48b5-8498-db04a2cbd539/what_is_the_interior_angle_sum_of_a_9_sided_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5956446-33a7-4c2b-8f12-944af4dadcf4/the_dark_prophecy_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdf884a-229b-49a3-a87a-b3d127fdefdd/21014862668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0903fce5-d2b1-414e-8ee9-8976065a2948/roxonugasukaguxaxopowas.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_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 5360 bytes
SHA-256: 6f2638ba42f35fb029c877665f0db8545650f72ae8deaa5491535602c1aab01b
font_01_sfnt_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 11100 bytes
SHA-256: e76d0313588ebb4b247decb375dbb343a2e55995a6534410d16b54b739a3bf46