Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d01f4aa0a75380…

MALICIOUS

PDF

76.7 KB Created: 2021-05-29 20:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 926307f8516331e7d79043751560e38b SHA-1: 047e0aa34b883b4a36fa1085bbd9480e5349c034 SHA-256: f8d01f4aa0a753809741d4c72a81dcd3111e63ddc2ff8c612e424494e11a418e
136 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains an external URI and an SEO redirector designed for phishing. The embedded URL, 'https://dugedepap.ru/123?utm_term=find+iccid+number+android', is the primary indicator of malicious intent, likely serving as a lure to a phishing page or a download site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/123?utm_term=find+iccid+number+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414678/normal_604661fb8b1f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5fd0622e51e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_60406d90d2314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_604823947dccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_6069fcde9e9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_6027e979bb27c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_603165912b860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff514e10e711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fd97a51908de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_600a5d6869cba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377924/normal_5fed6514ca943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5fd8e1fa972b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5fdfaa30c16e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fd9b3dcc79fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5fe195dc86bc6.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/dbb95fd9-ce7a-4207-8e15-b9b02725e60b/edinburgh_playhouse_seating_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe232e7-5259-494c-8f0c-03720a125633/36739171702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e3e822-a7db-4b9c-a7f2-40363696adc0/natex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a110a123-587c-41e4-b428-0e186adb37c2/give_me_liberty_an_american_history_volume_2_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa11656c-176e-4eb8-ac69-86d189b14580/who_invented_chess_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7edd78-2342-4621-b361-34cae6af26f9/21602551118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ed61da-4c53-4ef3-af0d-dd39686d9cb5/black_j_boy_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fed40df-fd31-48e8-8e47-c4586ae83837/40066673294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389a89ec-1d36-4b3e-a104-fbe797fd3808/3144541284.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_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 4972 bytes
SHA-256: 7e8de7ca797801a8e105abc6b4e7b6247b7512cf92d09abb564306684c7b8bca
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 10960 bytes
SHA-256: d2802a0c4b0b8cade9174e23237073c5ba6061e9be215b3dae281262ef3c2a59