Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3e8eee587e14e0…

MALICIOUS

PDF

79.8 KB Created: 2020-11-26 00:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e81e9738b4b17936f9283618f483c148 SHA-1: 92fdfebd1bd35c63045b3ddd4fa7666f2c66e312 SHA-256: cc3e8eee587e14e059507d65dd9f28259d6a548f5c5fe261468a1d7f91858040
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links pointing to various external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified links to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this file, indicating it is likely a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffmen.ru/strik?utm_term=whipping+post+song+meaning In PDF document text
    • https://nozudexujif.weebly.com/uploads/1/3/4/4/134480100/vikajuteletorimeru.pdfIn PDF document text
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/7421465.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/0f9de8f174d3b8d.pdfIn PDF document text
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/gilinikazinujogepol.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/vabovezu-dodamiw-gutagapaz.pdfIn PDF document text
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/gepive_zorijeb_pagam.pdfIn PDF document text
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/mazonumosatisi-surewoses-dasevafagu-xunovakekal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fbea2a5dc0f1.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/9b3b3e71-0c63-4d2b-b2a7-bcb3bba99107/18233296661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c5a154-38b0-4528-8192-8bc8f557f284/cobra_75_wx_st_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e9879f-ad03-404d-ad21-06f8b4222336/walmart_employee_policy_handbook_201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81a2f51-edd3-42e8-a9fa-8c10fb7b0af0/pasajigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e1cadd-9821-4593-9967-94972c7b705c/5119444551.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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 4908 bytes
SHA-256: 8c130a027ba144e04c47a267a11c479f5556c3ff17158e49ee4656b8653376ec
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 10820 bytes
SHA-256: 2a3323d2f3b19f3bc4cbdbd3303c4522d0c353308f33b213247c82f1abc313be
font_02_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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