Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ba536dd280c31…

MALICIOUS

PDF

72.6 KB Created: 2021-04-04 17:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0d64b21ce19883375306bd3e7b586eb7 SHA-1: c99accf4555de74a8a677a49b789a40857fc0cdb SHA-256: 753ba536dd280c312fe8ec5bb17502c4b14eec8537770abb36521cca13f7ee9c
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URLs, with a primary URL pointing to 'https://zajinet.ru/wix?keyword=sea+shack+menu'. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to potentially malicious content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=sea+shack+menu PDF link annotation
    • http://woberate.getenjoyment.net/ambientalismo_y_ecologismo.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/99986608431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_6038fd719815f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378855/normal_5ffb872080711.pdfIn PDF document text
    • http://svoydvalend.xyz/919772508198zlzw.pdfIn PDF document text
    • http://onesmall.space/62150363384zxpeu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fd082dbe170e.pdfIn PDF document text
    • http://kefets.xyz/adnan_syed_stephanie_mcpherson_redditt1hzd.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/lugitonoxetez35zth.pdfIn PDF document text
    • http://handler-autoscout24.com/133514509123xzsy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5fd1254bb432b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_21fecc038ada41e88d1e31f8892635ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5accab6-6a02-459c-882e-e1a5816b434d/easy_printable_hidden_pictures_kindergarten.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_7a7512e30c424718b2e26b85dbc7680a.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_a332b6b222304c5c879ca2de2b99480a.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_915b2764f71e48baa68ba4d0bce1d540.pdf?index=trueIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_6d6968d78ab54274bcb5a5f4747b76cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d89e23-ea63-49c4-b4f8-c90c67528de8/the_uses_of_enchantment_review.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_13dab9fa5c264baeae9bfec6122744df.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_0b3c3a4fc9254f0b9f88ec1b0a89c1fc.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_cebd063e1ba143d59f403105cb1cbdcf.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_d7e27b5c574444adb7b295c32a6f6bc9.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_767b440d2a854966978c140610f56797.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_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 5080 bytes
SHA-256: df5ba55f0b9f7437fbcc884076decf4cafdcbe33d42d31861dd41bbcaa7ba766
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 11152 bytes
SHA-256: 45f59cff970357d6b93c4f06f69ba8d9e6bb63156ec7a8bcbc0f1e242b833aec