Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d88b0d1a4a96f1…

MALICIOUS

PDF

71.1 KB Created: 2020-11-16 12:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a68d3186876d2381165817b59dd1eaa8 SHA-1: 1f6a6cbccf9d988ba3fee770bb9358c9e441ac97 SHA-256: 39d88b0d1a4a96f1c6cfff230920a55762e879ceb3307e255f161a994f8ddf07
186 Risk Score

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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded content, though heavily obfuscated, appears to be part of a lure to drive traffic to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://traffset.ru/123?utm_term=trivia+crack+hack+ios PDF link annotation
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/7989682.pdfIn PDF document text
    • https://zagezawuguzuvu.weebly.com/uploads/1/3/4/7/134731207/d8125d98452a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f8afabd1f190.pdfIn PDF document text
    • https://tojuseviru.weebly.com/uploads/1/3/4/5/134513446/83b39766d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5f95bd1157ed3.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/mizilekujamav_robin_sebesuzazakigu_gifamoron.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/5341872.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/d296180d624e27.pdfIn PDF document text
    • https://jemajodelevo.weebly.com/uploads/1/3/4/3/134394711/pagomaxitefubojot.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/abe56b97-54f4-4525-8ac2-d4485c632687/57870364726.pdfIn PDF document text
    • https://s3.amazonaws.com/ruletetunima/54191839149.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 4928 bytes
SHA-256: 4229ed4b83ea2122d95b9859a2686b8baaf0b125c3bd28eeb309eb93f2f0b11a
font_01_sfnt_off0000d1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 11396 bytes
SHA-256: e4fdfbe289d0a40b428e0391192b137a5ad8dcec9e430fa7c5456361364b0f3d
font_02_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16756 bytes
SHA-256: 2660e3f19262e0c1c514f7a0045fa503cee1831b49ccf21a997877b0058606e8

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