Malicious PDF — malware analysis report

Static analysis result for SHA-256 af99d75279dfb798…

MALICIOUS

PDF

72.6 KB Created: 2021-01-17 07:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fd9e9cfc9e740b6dfad38eb65ae015d8 SHA-1: 4d610ab55c7f96f40135dc9151fae2f595cb755a SHA-256: af99d75279dfb7985f94870ea294f4f9e0f03d6362224bcab9d763c7e0a0eb2c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'traffine.ru', suggesting a phishing or malware distribution lure. The PDF structure and embedded links are indicative of a phishing campaign, likely attempting to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffine.ru/123?utm_term=comptia+cybersecurity+analyst+%2528cysa%252B%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5fb9b9b9abb5b.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8qW8Cgg/19193261766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5fcac808a015a.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/Piijcpw/world_war_heroes_ww2_fps_mod_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/e0zicwt/kikuchi_disease_mayo_clinic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373987/normal_5ff28321b9b7e.pdfIn PDF document text
    • https://site-1186874.mozfiles.com/files/1186874/nugipanisexewegudeniveve.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/xikovezanowepoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5fa903cb2d6ca.pdfIn PDF document text
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/42d1de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_5faf8d04be4e7.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/9044013.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/pegozegi/general_training_module_practice_test_5_answers.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_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 5380 bytes
SHA-256: 3dce9ba815baeff9dc1ef2efa50090566d0c62db06358396867fcce78f4a0eef
font_01_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 12836 bytes
SHA-256: 407993a8330132eeaa35e84616aa2c802a4c99a762af8639504e704350eaff96

Open this report in the interactive analyzer, or submit your own file for analysis.