Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd97d30b2b54627…

MALICIOUS

PDF

71.7 KB Created: 2021-03-15 05:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e9739ca5720569a93281541cc6366bd6 SHA-1: b5c1a7309df2e4dddb062893d3ef6bf7c46cd1f1 SHA-256: 8fd97d30b2b546276867016926a986459207032d550b7290945214f582ed13e4
136 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document uses an image lure with a redirector URL, specifically `https://seumenha.ru/award?keyword=cracking+the+code+3rd+edition+pdf`, to trick users into downloading a file under the guise of a free book. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

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://seumenha.ru/award?keyword=cracking+the+code+3rd+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/fixosotefe/Cibnjbf/pac_man_game_boy_advance_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/wabitakenina/ggjziaX/toca_boca_kitchen_monsters_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/K5Lhfjj/pool_trick_shot_masters.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/gejflh1/danaruti.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/idZgcaa/53636622994.pdfIn PDF document text
    • https://cdn.sqhk.co/kisibijobu/ajbhGIj/football_officiating_supplies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_601b2caa1125f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_602f88d1596db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_602ef541c6155.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/H20vXic/classical_piano_pieces_about_love.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/jgkhggj/84891997497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_6043dd1aee46b.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/ejjhegj/download_frag_pro_shooter_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dubanexotokegel.myartsonline.com/39649906241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3a13c6-2b3f-46bc-9bae-074a1e44034a/79602641047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5ef84e-a687-439a-ab2c-258d6cee1e3d/what_is_an_easy_to_understand_definition_of_economics.pdfIn PDF document text
    • http://kogotiru.myartsonline.com/2020_camry_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277acaec-9157-40ff-8357-04667b24e7ee/how_to_describe_food_in_a_menu.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/artificial_intelligence_techniques_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa74e55c-6dec-483b-b6b2-7017b950a0df/jezij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae083f73-a383-4382-93ad-ef99854c1e2b/what_does_niv_mean_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefb3ed1-d58e-453a-bad2-722f4e20f79c/what_is_the_code_of_ethics_in_real_estate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d737438-1039-4e25-9407-85a588974dda/72020085805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68b2ffd-dd38-4d4a-8ffa-32bff63d4924/72039249363.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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 5340 bytes
SHA-256: 00b5774779ca86eb247d9b1c4141034c55f4970e28c2b4293da1f7c2efde24b6
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10268 bytes
SHA-256: a4148b8e7a4736d1e2b6aa9f889177cb68f802f7b5a3628f3057d5192ec4c618