Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7eb18358255877…

MALICIOUS

PDF

63.2 KB Created: 2020-12-31 14:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f06912558d8156c4776f4c4b3a456781 SHA-1: 4447176186ecc98b396fa4a70eb8cb69712ee5be SHA-256: ff7eb18358255877b7b6fa6e46448a4516603a6ed8b8e3f708d6b6d233b311b1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/123?utm_term=the+blind+side+movie+worksheet PDF link annotation
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/4738669.pdfIn PDF document text
    • https://vibupawovilopi.weebly.com/uploads/1/3/4/3/134377541/pitunima_jazulewopev.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/nLYUhdX/modern_warfare_tracers.pdfIn PDF document text
    • https://cdn.sqhk.co/dexavoba/f3qiaij/52443866747.pdfIn PDF document text
    • https://mokegeninu.weebly.com/uploads/1/3/4/0/134017711/romidobaxojefotepizo.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/b3jhOxh/17205031696.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/jaqbhcz/kenileteteripudemudiw.pdfIn PDF document text
    • https://cdn.sqhk.co/zefadanexa/Liahdvf/titozuduzererunu.pdfIn PDF document text
    • https://mamulexujixi.weebly.com/uploads/1/3/5/3/135390653/5931744.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/botomaj.pdfIn PDF document text
    • https://duxujofibedusor.weebly.com/uploads/1/3/4/5/134577283/julagidip.pdfIn PDF document text
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/tibaso-zobakozuxapul-juxizi-rovozifiw.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/ilD1ji4/cara_menyelesaikan_score_hero_level_339.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/mokamoba/battlegrounds_survivor_apk.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_off0000ba4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4F 5160 bytes
SHA-256: e4a80efff2637a0dd7d92e499bce152f7a567f6c5b2a9b80fc2938310aa84a21
font_01_sfnt_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 10648 bytes
SHA-256: 89a9ada1e0e69ce58c643532489fc5d3ce31ec17fc3bbdfc31aa7f8c50afa716

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