Malicious PDF — malware analysis report

Static analysis result for SHA-256 0037f7c97c74ffed…

MALICIOUS

PDF

64.4 KB Created: 2020-11-25 04:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a581714a66d2d51c536f7891bed4a918 SHA-1: 16ccd9804918cab82597848e0dc5050632ab029b SHA-256: 0037f7c97c74ffedfe4aec6fdac0534b06c31e46683cab1458a7446e84e8f8b7
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirectors and link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=joyas+de+cristo
    • https://vukosigubew.weebly.com/uploads/1/3/4/8/134860762/2353324.pdf
    • https://jexumaravoza.weebly.com/uploads/1/3/4/2/134265375/b12de0.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/6551180.pdf
    • https://cdn-cms.f-static.net/uploads/4451377/normal_5fb7eb60702b5.pdf
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5fadfd9185651.pdf
    • https://kizulivuvuruzor.weebly.com/uploads/1/3/4/8/134850547/3888586.pdf
    • https://pivifezimar.weebly.com/uploads/1/3/4/7/134719334/9839027.pdf
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/7015ce783f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1bbad816-ec0a-445a-b575-87b14245888b/perl2exe_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/47bb0db1-ae1d-40ff-a74b-44694a7c96b0/what_animals_are_herbivores_and_carnivores.pdf
    • https://uploads.strikinglycdn.com/files/041913bb-1470-4c4b-8f82-ff2304f150a7/wopejeviretajosu.pdf
    • https://uploads.strikinglycdn.com/files/9d18f4b0-3824-45d4-9bd7-2627ea243901/sowumurisepero.pdf
    • https://uploads.strikinglycdn.com/files/18f35752-4842-46e6-8016-7be9dccc3bcf/diniwax.pdf
    • https://uploads.strikinglycdn.com/files/98a26661-3fe0-4661-853c-8cef358693a7/the_prophet_of_yonwood_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdfc.bin
82741409e1646ff9a91666ad32fd637c06806382164e551bea2b75b06d5f66ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFC 4992 bytes
font_01_sfnt_off0000cf0b.bin
3300d9be1d562987e119c9f243c939e9eb088ddca9cba694ba2f15bf18266664		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 11396 bytes

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