Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a0da574a81a62d…

MALICIOUS

PDF

64.2 KB Created: 2020-11-19 19:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2aa7750975b4ddf58c89bd49a6d6b421 SHA-1: df5cb0a3497d96ea99c5aefd4724d7af6546f477 SHA-256: a8a0da574a81a62d8a47e5c50360eb04c3941451f8af3737ef88f57da5510fbe
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The embedded URLs and the document's structure suggest it's part of a campaign to drive traffic to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffine.ru/123?utm_term=moto+x3m+unblocked+games PDF link annotation
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/2131925.pdfIn PDF document text
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/sijejobigelusonegub.pdfIn PDF document text
    • https://fodexugamo.weebly.com/uploads/1/3/4/8/134851562/d6ef215aad1b5.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/gufifiwet-jilezevemabo-ximaj.pdfIn PDF document text
    • https://lidoxuma.weebly.com/uploads/1/3/4/5/134584164/54eabae4.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/d0e09f48406b18.pdfIn PDF document text
    • https://rinojoxo.weebly.com/uploads/1/3/4/5/134598976/powifa-pavevevaxilil-dibiwozuj.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/0e0089b3-bac0-48ed-afbb-a816c0917d6d/electric_circuit_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c417817-3d0d-4f3a-a4ad-2bd4e444fd22/viloxavofak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452409b1-b96d-4444-85c3-8d8cc842b5c0/church_directory_pastor_s_message.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f89362-e073-4b4d-8781-877a554c8019/pedif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd8eddb-a393-4ed2-98ed-81e05c706667/bubamexek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad83b5ae-da05-4727-94c2-a2aecf746ecc/jadigavasivimeniwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8abe3a-3f4d-49f4-a6ca-28f1d3178f5f/16411292801.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_off0000bf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF78 5604 bytes
SHA-256: c4d18f3535a07adfeff78a89485710ec1fe52afe6a692b1d71741780d30f00ed
font_01_sfnt_off0000d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 9864 bytes
SHA-256: e97250aa0f7b92c59bb6933b74debe9e14dfc93d3cf76d9affb7e16c25bce451

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