Malicious PDF — malware analysis report

Static analysis result for SHA-256 61901e5b5f154d7a…

MALICIOUS

PDF

41.8 KB Created: 2020-10-05 15:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: eeb17dd0bf8edbffe01434eafecbfc5e SHA-1: bdd8efb8786ef00ebf5d40fef880ba299184e54a SHA-256: 61901e5b5f154d7a0dbe77910f82cf48dfa00aa6e013ed28f0ac7d4aad15c538
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=acceptance+of+resignation+letter+pdf In PDF document text
    • https://site-1040974.mozfiles.com/files/1040974/66603061791.pdfIn PDF document text
    • https://site-1039171.mozfiles.com/files/1039171/80631484296.pdfIn PDF document text
    • https://site-1040002.mozfiles.com/files/1040002/vudaguvodarifelas.pdfIn PDF document text
    • https://site-1038909.mozfiles.com/files/1038909/nemilidomotuxezejefiwek.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/7593433904.pdfIn PDF document text
    • http://files.reisitellimused.com/uploads/1/3/1/4/131483287/wolamosiposapabexi.pdfIn PDF document text
    • http://files.humblejumble.org/uploads/1/3/0/9/130969176/af410bad3c686.pdfIn PDF document text
    • http://files.pennstatecsl.com/uploads/1/3/0/7/130740127/dc7ce9d3.pdfIn PDF document text
    • http://files.braveheartsupport.ca/uploads/1/3/1/0/131070713/pipelagesi.pdfIn PDF document text
    • http://files.retreatatprairiewind.com/uploads/1/3/1/3/131379118/lujos-fanarejabu-mudiva-lizogij.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/9c31c431-d93d-4597-91b3-3bec403a25e0/27903703925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855e1790-7aa9-4f69-92df-d8b7f2e628ed/63655579771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34378a4-297a-4bb5-98b3-cd59b2193e1a/muxatevapox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da89e42a-84de-48cb-b382-1570bfeb5164/80027533595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8879604-2ea2-4711-a991-7eaef997e7ef/kerojatukedarun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9c7321-a04a-4400-aba9-46e2a8bdcea3/bipemizepofetewunusosij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aceb13e-ac2d-4738-8d8d-0feb8d251764/71136610930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9dc6c1e-926c-4c0d-8799-471f4177efba/sugafusimezedekuwotod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9667b8c-4f30-4a9d-947c-b587202f32d2/podudefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9bda886-5f24-480e-97cb-f2245bb9f746/45917512050.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_off000061ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EF 5312 bytes
SHA-256: 168c0ca1e36661e97f2d378b4686aeec84dc33c6ab864f92b10e3d1bca04474a
font_01_sfnt_off00007414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7414 11628 bytes
SHA-256: f2901151398161c8832fd150366b320fd91d0c601e6e56b85e10a35424f79356

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