Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a63ea1efbc81be…

MALICIOUS

PDF

72.7 KB Created: 2021-02-27 11:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1cf86a6a1249370780256efed4c6ada3 SHA-1: fe894d419e3c23d607b25db9c436ae7b059729c1 SHA-256: 25a63ea1efbc81be9aff85a2a1faeb18602e04900bb182d1143e3e706b9c4b80
196 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/wix?keyword=online+learning+platforms+for+elementary+students PDF link annotation
    • http://my-favshopd.online/vocabulary_workshop_level_c_unit_4_answers_antonymsz53zu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_6002c0aaceecd.pdfIn PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/4915026.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5fff7c5bb30b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5feb15990b56e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5ff537c3a47ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_601afcb701afd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanaladu/80641701781.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/23204258049.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/gizaguxunisadefadiso.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/abrasive_jet_machining_advantages_and_disadvantages.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/76179739582.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/wuparubonana.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/alkaline_diet_food_combining_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/acetilcolina_y_memoria.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/dexalefotexomubi.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/zeforib.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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 5492 bytes
SHA-256: 7f77c4bcdbfe9320ccbfc2caaf8af656032e4b5885829e4e8fa1bc5f0cb89d9f
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 10136 bytes
SHA-256: 41dca158984c13b724efa63ba0295fa384c12db804aeb04b8cca06273636fce7

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