Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0749ee2a6281c1d…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 16:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3caf0c85f0e288b4221c11f15870f4b1 SHA-1: 22d4cfcf277e941b9df8bf73b738025dcd3050e4 SHA-256: e0749ee2a6281c1dc802d0af1745a4d28a4568aa668c882167a61d1b7d167d96
186 Risk Score

Malware Insights

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

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 0.9992

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://leonvi.ru/strik?utm_term=how+to+text+on+a+doro+mobile+phone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371003/normal_5ff77219a3492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5fcb6685cce1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_6004d5f50e386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601bfa21a6ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_60470005bec37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_b14618637dfb4d41a0a3462b4da6130a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/14964199858.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_2f9f2d550e26408ba3e7d57db204f0f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/regitilavelizilebadisa.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_69701433687a4be3b5b2960e46df4b7f.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_3f2749ce186442ac98ac2fc2ac1f6778.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogijexu/whirlpool_quiet_partner_ii_drain_pump.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/gunivibakokim.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/zitanozijowovizibipimebof.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_6915327a49134228bbb4ad57465e0c23.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_0125518eeaaa4e2b8de91ff160ceb440.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_39a5e28485144b3a8b886970a0ca9b71.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_b3b3c284ecc44fc482dd7927d1cf50ab.pdf?index=trueIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_8e62a93bfee94c68bae454955ffe655a.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_b1ac775116934e59acc686c61675415e.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_7efc27f1aa4e4f1387433ac5221c38be.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_022354487c0d4d409891d5a2ad7eb88a.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_f0ed6bd4593349cb83afc9f2202588b8.pdf?index=trueIn 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_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 5284 bytes
SHA-256: d441046f461d0bda10ea564aaf447f10cf85ea07c78664ef0c7ff4821310edc6
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 10620 bytes
SHA-256: cdd0c4c040a7f7dd35952ada30f3c2e07c7bd3fcf724bf58e0afb1f56f0054d2
font_02_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e