Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e5c6616db6b78a…

MALICIOUS

PDF

67.1 KB Created: 2020-12-23 10:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 54e5b1eb5f59e3013810a348d91ee0dd SHA-1: 992ad58c1194b51bee002bf365cfed69b31af8ec SHA-256: a6e5c6616db6b78abb857fe18565c124b23ea6a64833a317c46845a917afa36f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs, with one prominent URL being `https://trafftec.ru/strik?utm_term=npr+weekend+edition+sunday+june+21+2020`. The presence of a link farm suggests an attempt to direct users to potentially malicious websites for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

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://trafftec.ru/strik?utm_term=npr+weekend+edition+sunday+june+21+2020 PDF link annotation
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/tadenaxag_sijarogegagoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fceb63f68ab5.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/8505524.pdfIn PDF document text
    • https://jowajasodosetu.weebly.com/uploads/1/3/4/3/134308851/zupizeronibib_zeremogizopi.pdfIn PDF document text
    • https://newususop.weebly.com/uploads/1/3/4/8/134893013/beripexurise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5fd12f9153de9.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/xalepuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_5fdc446a17874.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/4564936.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/63fc4497-7645-49e3-9fbf-2f0f78e3a6fa/pathfinder_mirror_image_and_invisibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321cb757-e058-47d1-ad44-a159695426bc/mofotukuzugemonif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add90fa8-2e0c-4043-83f9-746184088802/81457523833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdba45d8-7f09-4503-92ce-48f16e434f8f/record_the_payment_of_accrued_and_current_salaries.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 5552 bytes
SHA-256: 1609709e12467266b1cd690ad38fe029ea23a1745d9da782804bfc6f2c1b6569
font_01_sfnt_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 10492 bytes
SHA-256: 5860cd7488e925566f15900fadf244a65082629de062faf6bbff131e9bb8894d

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