Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d32ef5648437188…

MALICIOUS

PDF

66.0 KB Created: 2020-12-15 22:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b5fc7542a3f9b82929be8cc603139231 SHA-1: 08fc550d1ca096b55fe60a9b6140c4c99e33fca5 SHA-256: 4d32ef5648437188f9cf27d69898811d28f419eae7f0fce1ee1ce3f166fb9e43
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://trafficel.ru/strik?utm_term=barrett+model+99+rifle PDF link annotation
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/6050028.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/1072667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fbb2134cfa46.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://boxagabopevonud.weebly.com/uploads/1/3/4/3/134353696/favut.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/zikula_kalefiwopuruda_rerobiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fd3930931bb6.pdfIn PDF document text
    • https://lojedakefedo.weebly.com/uploads/1/3/4/7/134743006/569825d88fe7.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/90f7b7a5-5c2d-4d29-a39b-8f9ec4656e53/lelejimekukulowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d107bcd-b5c5-4654-9cb8-41e0c582df89/faviwexetitafanokonekopud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e44318-67ef-427e-9ee6-c1c2cd2515b7/zozasaxepimunol.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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 5080 bytes
SHA-256: d6e7609bc1a6d96343637e13d06f33978542a691fe555a3ee052e1db8e76da44
font_01_sfnt_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 11820 bytes
SHA-256: 15bfa96e9b7591b28a83e7722bb3589f189579e58913415f7ec04c50ffb46b7b

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