Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdf0f9df4e05d27…

MALICIOUS

PDF

70.4 KB Created: 2021-05-28 02:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2ff3f61aa9e5ffabe7750458855004eb SHA-1: ed6c5043f879af4b29659a94ef94c45c09044fed SHA-256: acdf0f9df4e05d277585eb51ead87da73758f21a79f467896bfc379a7993ae6e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the document's structure are consistent with a spearphishing attachment designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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=basic+geometry+definitions+independent+practice+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444374/normal_5ff1dc10c148e.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/lalewoxiruwemebo.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/nurevabe.pdfIn PDF document text
    • https://golisoni.weebly.com/uploads/1/3/1/4/131437826/zinepuj-fubaga-nulemig-gubapalibawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481278/normal_606b730c11efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_60599d6cb1396.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/siferikot-ribal-kedamezefime.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/maxijipozirixeg-bawidijoxijar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_5fe80eb7a2cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_602105ce555e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391903/normal_5fe53512ed72c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_602e1e217abe2.pdfIn PDF document text
    • https://mipijipibax.weebly.com/uploads/1/3/4/8/134873473/32cf6b48.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/d513c9d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_60583be1af66b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5fe39d06c9620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_605b86bfb04f3.pdfIn PDF document text
    • https://mepolelo.weebly.com/uploads/1/3/4/6/134626310/funifekip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_6017a792b1f73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444657/normal_6000409ca1efd.pdfIn PDF document text
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/vedeguxo_xewuzotepasakib_wudinutega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_60320471a45e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_606e8e23e77c3.pdfIn PDF document text
    • https://femanutokit.weebly.com/uploads/1/3/3/9/133999532/4954781.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/afcd044f-db8f-4de3-99c7-daaa47c2865d/dresden_files_wiki_magic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91e0a8d-a681-43fd-96ad-62854b8a3fb8/wanarevedot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034d0066-3f92-4ca6-be23-c909daa44e02/tebovotajap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e6a552-b6c3-448d-8fb5-6a2dea613fa6/80571997925.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_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 5844 bytes
SHA-256: e39219ead0b2314de94c95e78970cd40f754baf9fdb5db41f42ab284330a3a2e
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10184 bytes
SHA-256: d54b72e8af0cbe29b0e689ea53a0ed197b3018a6747fbe9686285e69910d6d49