Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57a4659b7ac3091…

MALICIOUS

PDF

71.8 KB Created: 2021-03-06 17:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: dc3fe31cc6d84182c93a1110d29071b3 SHA-1: 17fbcb76ac2eb633cad0f2e5d3cd6865d1253798 SHA-256: c57a4659b7ac309163b79f8f353b80b4f2f79b858c1066a294a01d80a0f1785e
186 Risk Score

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://vilenefex.ru/strik?utm_term=youth+football+training+drills+youtube PDF link annotation
    • https://rawamujorutemet.weebly.com/uploads/1/3/4/3/134360263/kopovigezaburevo.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/how_do_you_describe_a_beach.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/zodoloriregedi.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/gg1iaEz/34892896072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_601a9b517cf6e.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/14558269376.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/kihBygc/japanese_railroad_crossing_toy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370294/normal_5fccf32e5bc9f.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/gcihtDy/bowling_balls_under_100.pdfIn PDF document text
    • https://xurozakewera.weebly.com/uploads/1/3/1/4/131414240/3540334.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/jEgihjM/khloe_kardashian_and_tristan_daughter.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/4108492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5ffb1fe7d5fee.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/ee7d3194-8017-4174-b802-970d4d817782/56186501334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add04e37-4c0c-42a3-8ff6-3f94c003b3f0/char_broil_performance_grill_wont_ignite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5437876-1023-4481-8b6e-6379be489ba7/69131697190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a811e2-7f25-419a-a56e-9238f0cc84c0/the_natural_book_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10b4a52-3abb-4b4b-8e33-285fe174bd62/tokyo_ghoul_re_call_to_exist_characters.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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 5372 bytes
SHA-256: f0af461463613dac2416c23f9c9eb32b2b9e4c3058dd46764849496979ef0635
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 10420 bytes
SHA-256: 77e3576cd296f39e392a740abb31d4452802580c31d8ce84714c6fcd73084fb4

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