Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66c8f7cba90d175…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 08:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38b81496acd70f3618302d78865e581f SHA-1: e6cd1866828a845b032567d47cffbf9ab0a7b77e SHA-256: a66c8f7cba90d1753a96f93f2e7666626272ec8411b95d9b566571d7d12e286a
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 0.9997

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://lozipotod.ru/strik?utm_term=the+infernal+city+and+lord+of+souls PDF link annotation
    • http://zuvels.xyz/zavemwlv0d.pdfIn PDF document text
    • http://reform-st.ru/integumentary_system_quiz_with_answersok28z.pdfIn PDF document text
    • http://flowerport.shop/17448302443jsadm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5ffb6d2d3e225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6014e94d53135.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/38439301834.pdfIn PDF document text
    • http://return-0.com/segebimodilolonabal5auqn.pdfIn PDF document text
    • http://ita-talia.fun/fadapexojeguweferasixawus7jv9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_60426088a6491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_602c0452d6212.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwixatokido.epizy.com/16965094446.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_c3bdc968b1da4433923b257f7a55282c.pdf?index=trueIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_040c09fca9da4e0696beaf0dfc5d389e.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_f599bb5e3cbd4234907de2c50cec2eb6.pdf?index=trueIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_c954030fb1a84f74b5deae29408cd89a.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_26544701226a4d3890765fb171fc60fd.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_0381e42ef3474dfd8b0e96d1d66cc43a.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_300f9c3c13ad43309aeb88894e942221.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_def54efd392f46e6adf50b2ac5a4d487.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_f9adf4d392b94feba27cc6a966491ffb.pdf?index=trueIn PDF document text
    • http://lewamomad.epizy.com/handy_stitch_instruction_manual.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_1675b90a5196469999b92a0735b6b0fb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 5160 bytes
SHA-256: d10c4724441337683c96418ff5cace891ecf13813c00867d458170d799c1a2c5
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 15180 bytes
SHA-256: 756ab77d7d10b2411c84613f8f5c72b2141791f15b95b3c2bfc75f35a675aeb5