Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5d32469f2d8eda…

MALICIOUS

PDF

64.4 KB Created: 2020-11-23 19:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b6d8014222bdd306a54e7d06c5011bc2 SHA-1: 4a0763e95e2b56c9d2bf76887ec61754c9423968 SHA-256: aa5d32469f2d8eda32f7a59546f5a247978cf5a03b63eeb2223e3ad79a435a75
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to generate traffic and potentially lead to malicious sites. The presence of a known malicious redirector URL and the ML classifier's high confidence score further support this assessment. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=yamaha+rx-a880+review In PDF document text
    • https://popekuzukije.weebly.com/uploads/1/3/4/4/134471955/6305887.pdfIn PDF document text
    • https://kapovisawok.weebly.com/uploads/1/3/4/6/134652754/zumuwipasuge.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/foxunujigagom-mosifaxuwik-dosilitifuw-jilumigobasu.pdfIn PDF document text
    • https://damuxuru.weebly.com/uploads/1/3/4/0/134040763/a522158.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/8114263.pdfIn PDF document text
    • https://ganajefij.weebly.com/uploads/1/3/4/8/134884795/ef13b542cae199.pdfIn PDF document text
    • https://zanugikujo.weebly.com/uploads/1/3/4/3/134399251/kopuvemajeliza-jirobizafajo-sopavokasig-pijotajes.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/soribovuxiwure.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/zategafozasiru/endeavors_meaning_in_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46295210-df3c-4ac0-9ad2-4b356e96afeb/padubetosasimun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4935a4e-9332-4947-8b37-481d85c9ffe4/sagoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f75a2b-8b0f-45ec-9d04-240e36bfb656/28086733991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54b626f-b5dd-40cf-997e-b3898bd097f4/bufijol.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/derufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974e8b22-ec77-4501-979e-543f3a24a606/wafebe.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_off0000be90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE90 5264 bytes
SHA-256: 6e608f0b7457b3d37d04d2bc2c8d6b880e43692af0bec8eb04690bcc05045616
font_01_sfnt_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 11056 bytes
SHA-256: 4ce797a908954a85bc986b6b9cc06787d99d5e4a2d13a37f1a1e9f01336747f6

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