Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac15043acb7a402d…

MALICIOUS

PDF

66.7 KB Created: 2020-12-04 14:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b52987bd094fb1708a378eb7f5da67ba SHA-1: 7f91b044d72dccc662f721324c2ccb8a175b83b3 SHA-256: ac15043acb7a402d5ac709abfb477c4fe727911aabea4d9f2fcc711d350906ba
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to various websites, with several identified as malicious redirectors or part of a link farm hosted on disposable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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://gettraff.ru/123?utm_term=verifynow+p2y12+test In PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/621938.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/505227.pdfIn PDF document text
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/fa3a445f.pdfIn PDF document text
    • https://xiwofisenitew.weebly.com/uploads/1/3/4/8/134879753/wididakar.pdfIn PDF document text
    • https://nirorozarijax.weebly.com/uploads/1/3/4/3/134342495/gagamude-tapitag-nivodepul.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/nevowimo/broker_compliance_evaluation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b4070b-c3ce-4256-8aff-2cde51379041/dokkan_battle_beginner_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ef3c59-36a0-4149-b9a6-2fbc475842ba/23897699598.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c48c104edf1d778017d3/t/5fc56a2b9d79364840444888/1606773292703/holt_algebra_1_homework_and_practice_workbook_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_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 4996 bytes
SHA-256: bcf25397f9ab26eb418476a92268bd786175509ba5b5492744a5915c2dd4d6b9
font_01_sfnt_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 10380 bytes
SHA-256: 9ae71e5532c5774d6e74dee2e1c728958bc3a0995f3dfa4836cedf27ff489a47

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