Malicious PDF — malware analysis report

Static analysis result for SHA-256 87478ea7fa0b94a5…

MALICIOUS

PDF

79.1 KB Created: 2021-05-05 18:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 795c6e55117e85255eeed4558a0c81ee SHA-1: 26d83a4d070894e1a4103bbca455b0ccdd14c68f SHA-256: 87478ea7fa0b94a582c7a21008c218919aad7ce476380003764826e26579f735
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to disposable hosting, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/strik?utm_term=2013+subaru+impreza+2.0i+premium+review PDF link annotation
    • http://kyhni.site/muduxilhc8y9.pdfIn PDF document text
    • http://5dradio.ru/does_dish_network_offer_senior_discountsx430z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_602e2f6b8f342.pdfIn PDF document text
    • http://quickstore.pro/lake_street_dive_side_pony_torrentssjeq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423145/normal_5fce23501723c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_603829581568d.pdfIn PDF document text
    • https://zuwuloju.weebly.com/uploads/1/3/2/6/132681456/potulonidade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_6015d8b5d6b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6049488d5e494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_5ffe89ce7579f.pdfIn PDF document text
    • https://letonezesuju.weebly.com/uploads/1/3/1/3/131383444/gogadelidezo-tafilazojape.pdfIn PDF document text
    • http://dreabling.online/what_is_the_official_supreme_court_opinion_calledtdmog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_603398a621963.pdfIn PDF document text
    • http://kpupnov.pro/ss_cable_recharges51tx.pdfIn PDF document text
    • https://fivefijoxiwu.weebly.com/uploads/1/3/1/4/131453543/7ec818d.pdfIn PDF document text
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/tifewitelunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_604cf02303f0f.pdfIn PDF document text
    • https://zurokexotuv.weebly.com/uploads/1/3/1/3/131384071/8653672.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/de02995e-46cd-4bfc-b190-e88bffacd568/montana_1948_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cae14a2-e01a-4053-9254-f7298a9a28c5/vupekiz.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_8ccbd610cf644c9995a2a04a7100afcd.pdf?index=trueIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_12703be54fe9421f8a19b10cc336f8c9.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_380d07014caa4a7e9fc521a6cbf7d444.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b1f3a9-bf19-43f2-a0cd-d6122b614c50/mofanojukumijifaxusu.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_60568009595c48259492dd2b9eb15bb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ca66b6-8289-4650-b9cc-f90380333607/sharp_aquos_60_inch_tv_2010.pdfIn PDF document text
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_a6067db9a73f40bbba3158472db2d458.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_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 5700 bytes
SHA-256: 506220a6fd83fcfabc04460904f832ecffe2cd9d6b0c81b144f95b27d92d05a7
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 11336 bytes
SHA-256: d87ce1410e6798ef94e101817848e81d6a9240f24f433663a96dc2e41822e545

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