Malicious PDF — malware analysis report

Static analysis result for SHA-256 e623596a6cca6284…

MALICIOUS

PDF

70.3 KB Created: 2021-02-01 22:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: c51b18f52e6841d7bb3e947f897fd429 SHA-1: 620ab4437d1f8f10e48fc9ecc7564e499addefc3 SHA-256: e623596a6cca62842c8c76a052a20f1fa61914dbdd6ca01bfa07e25356f2e46e
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=cub+scout+segment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487431/normal_600bf588797e2.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/weduluva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_60134cb41f403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_60182c3ed22b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5fdbcb9102cdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamumilow.rf.gd/beethoven_sheet_music_roblox.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/ruinart_blanc_de_blancs_tech_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/metal_gear_solid_2_pc_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/black_chickpeas_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/gudulevexalimofuranelivu.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/88594607980.pdfIn PDF document text
    • http://karifopiti.epizy.com/ielts_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/zalo_cho_pc_win_xp.pdfIn PDF document text
    • http://kofipazefoleris.epizy.com/gukorasesujewolu.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/topatazeparabopalizi.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/67149284012.pdfIn PDF document text
    • http://zezinoretebeper.rf.gd/cafe_del_mar_chillout_mix_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/24109409858.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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 4828 bytes
SHA-256: b33939834ea9862dbd614f9fcc5b30f855cefd956b871f33cf00689d22602c5a
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10384 bytes
SHA-256: cd35bc5e6eae6ec5cdcc99c3926da56119784ee9c4bda94545a4cd0ad01c9b7f

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