Malicious PDF — malware analysis report

Static analysis result for SHA-256 3585782400c020e0…

MALICIOUS

PDF

76.4 KB Created: 2021-04-21 12:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f455ea05881bf36d9d59447914a2646 SHA-1: 7bc25fb10a18d950432fe5fa6d62c3f692dee919 SHA-256: 3585782400c020e010aa3e215e850563a7fbb0ae10a6f0b4be0bbd0c51d31b26
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on link farm domains, suggesting a phishing or scam attempt. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass external PDF link farm, and ClamAV detected it as Pdf.Phishing.Trojan. The embedded links likely lead to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=the+revised+hassles+and+uplifts+scale
    • https://mitanifujokuvu.weebly.com/uploads/1/3/0/9/130969645/9d03e48bd901.pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/865c5c5f28f.pdf
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/mutiwinema_gesup_gisomeli.pdf
    • https://static.s123-cdn-static.com/uploads/4426696/normal_5ff1dc0f1190b.pdf
    • https://dawifebenunu.weebly.com/uploads/1/3/4/3/134374742/7f570f1.pdf
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fff71f852643.pdf
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/wulelovubogujufaku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/24995793-9810-491d-ab24-651220f21ab7/82975155446.pdf
    • https://uploads.strikinglycdn.com/files/1bb4e670-dd76-4365-a3ac-ec07e09a2f4c/jeriwujiti.pdf
    • https://uploads.strikinglycdn.com/files/89bb8d30-e8c6-4e41-aa72-0422136ca893/55774439925.pdf
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_65fd183e83094e90962eb39a395b464c.pdf?index=true
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_4332e0576b0d43b1b11b984d12145b0d.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_09236f77774a4616af5c8817437d2cea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fa9e22c0-8af9-4a6d-a6ae-20d4d18e32c0/east_of_eden_book_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/a81cd343-ff9b-43c6-9db2-3a889a7e7163/31119667509.pdf
    • https://uploads.strikinglycdn.com/files/c0ea7d32-4939-4f9c-8cc2-00f42abba121/duzopuwavonabiziwagi.pdf
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_8e53dd3514994895abd6e84f0c36c50f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5f215bd6-b1f7-4515-980f-9467a67ad8e1/56155969154.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_off0000ed64.bin
8b6667e54546192496cd20e8a031761588456575b1b7f32234aa5e37c0ecb796		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5252 bytes
font_01_sfnt_off0000ff3e.bin
6c3560c62f6030f1656f48c97ec0c8216523ede425ce1a0ae187e340f1d60064		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 10916 bytes

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