Malicious PDF — malware analysis report

Static analysis result for SHA-256 1729a2fd0275ccc4…

MALICIOUS

PDF

64.6 KB Created: 2020-12-18 17:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 900ab1499fda1a8efcb4550c69a5a4b2 SHA-1: 197c8224c5ae5798f41bf5ec066606371f33e871 SHA-256: 1729a2fd0275ccc45decc471822a0482fe2c86f11d915fca86306a62d3e63ecc
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?utm_term=columbia+county+recycling+center+portage+wi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5f9f9efe1ed0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_5fb39c3d6bc0d.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/ketovogodubenubin.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/a4e83e6bf0d.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/mejen-namijekirov.pdfIn PDF document text
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/vuguxe-kigerupes-difesofoxan.pdfIn PDF document text
    • https://moginirem.weebly.com/uploads/1/3/4/7/134769545/f19bf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fbb47acc6222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f91f0e92504e.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/wovivabojudakez.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/cb5a4d21-7452-4be2-b7bc-6427198b7aa2/ge_zenith_zts_transfer_switch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048e1ebe-86b4-416f-8f44-7d790042e184/dorul.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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 5312 bytes
SHA-256: 713f0e067b545d8817e524c63e4822419072fddb6251dc542489b1f112a4b49f
font_01_sfnt_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 10324 bytes
SHA-256: 3d784b5a9de30937266f71c1f73bdcc5a3369c7069141b78d805b3e07a77cc71

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