Malicious PDF — malware analysis report

Static analysis result for SHA-256 18747c56ee5e7da5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-19 01:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6acdeb5aecb77a8307e4fd30641e7b05 SHA-1: b271156cb2c17c3d42f21acaa6d8d73a7b60d2d2 SHA-256: 18747c56ee5e7da5f01b442b8e12e7c488c8576d2ae0825df039a8e4f11ad0fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm designed to direct users to various websites. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a malicious intent to use the document for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs, such as https://nipisod.ru/123, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=ghatna+chakra+books+pdf+free PDF link annotation
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/birojabuwe_jopazomixebopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_6053da4041d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_6043e35f96095.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/igZ5Tij/xubenojotoborajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_5fd6217ab754e.pdfIn PDF document text
    • https://wojulifurezusek.weebly.com/uploads/1/3/1/4/131438898/bafiteki-bekekina-bipediwedumit.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/2jiphcM/the_culture_map.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/80634971349.pdfIn PDF document text
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/3bc43c4f.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/pifodinuza-nalonisim-sadalote-rafezasor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futinisebepafez.rf.gd/how_to_maintenance_sump_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08915ee1-d07c-4636-bf65-fec82e7d5a3a/54234758857.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_41f64b228b344bdcaa7ae64e7d92fc9c.pdf?index=trueIn PDF document text
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_b01273ec30d541a2ab70b3dbab5be3a1.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_e4178f95ab63477d8f06c35e9e74f5ad.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_80e07eb8197f4072b66e1e91b1b25c79.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_991507d9ec084fb1b2ae0884da72c1b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d6377b-eecd-4967-aff3-877a4759736b/90473844502.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 5448 bytes
SHA-256: 627c0e12cc2a1691b0703ad11980c777f18245b0148b6c68aabc0327b474b5d6
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 10724 bytes
SHA-256: 41bd058a30645d61604e3aef4767166299c1a47e38bfeeb8705c5dafe5983e87

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