Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc903729cbb9f33b…

MALICIOUS

PDF

67.9 KB Created: 2020-11-24 11:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d58ec38cc8b14670fe5ae407c2d67364 SHA-1: e825ac5d4c53c5c6b8332c7bc9255b667e9cf924 SHA-256: dc903729cbb9f33b1f736ac4f45bf98114f23711f5bc4b1ed9e32cab606e75f1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, potentially for SEO manipulation or phishing. The document body, though heavily obfuscated, suggests a lure related to "Simulador de word 2016". The presence of external URIs and a link farm points towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

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 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.
  • 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=simulador+de+word+2016 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f874a489535c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_5faafd1235df7.pdfIn PDF document text
    • https://badipixurer.weebly.com/uploads/1/3/4/4/134456466/vexagob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_5fa05e5bce4d2.pdfIn PDF document text
    • https://pururejipe.weebly.com/uploads/1/3/4/2/134265449/723b9e58178f.pdfIn PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/bepenepavar.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/nokufejadigom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f8b19fdf3467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5f9e04680388a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_5fab77daf047a.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/957b74cd-bb4f-4d56-b54d-2758a26242c5/vargos_houston_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c2e10f-fe88-435e-983b-4121a6c3d3b2/14231453816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62bccc6-e7ee-487c-b3ea-1b3977170644/82816784404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e75066a-c220-4117-8747-243f3b31f92c/powerdirector_14_ultimate_torrent.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_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 5468 bytes
SHA-256: 36639d1e69b2b9ab647e35b6a2c51270e1f0b4e15135412097b851656b5a7fd8
font_01_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10952 bytes
SHA-256: e9315dc165f6008ef0931b91334f5de11a5d8abb1e71aebf133b279f43383189

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