Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7739cbc9c15f607…

MALICIOUS

PDF

91.2 KB Created: 2021-04-04 13:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fec7c65073adf1c18b35412ee30cbc1e SHA-1: c36657fa8c58a98104bd3d653c0fbbc55380b09d SHA-256: b7739cbc9c15f607fea8f5592ad027283d5ab5accdf635f00d1d34dca358f956
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=maximum+metformin+dose+for+pcos PDF link annotation
    • https://cdn.sqhk.co/wujejelot/ZghghL9/race_car_wreck_today.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/GjgiVoA/destroy_all_humans_guide_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/mhhoidp/general_motors_arlington_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovixewin/eH3QOrc/free_fishing_life_svg.pdfIn PDF document text
    • https://cdn.sqhk.co/fajixojemom/k7Czhe5/jhu_apl_glassdoor.pdfIn PDF document text
    • https://cdn.sqhk.co/misumirotoj/jbJChbm/snakes_and_ladders_board_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kasapisu/qhjhFtT/rubebegafad.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/58403285119.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/8604284f-62a9-4406-b530-2c00d12d1f86/2021_lexus_es_350_f_sport_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae9ce44-0418-40c9-a77f-24baaab21d85/letra_y_acordes_del_canto_saber_que_vendras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/362fa38c-f9cf-4652-a2ed-ad07e1626264/sinulujomegalipebajoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bea7e27-e087-403b-a187-fbaf79c9092b/how_to_watch_marvel_movies_in_order_chronological_and_release_-_radio_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc19faa1-5bd9-4c53-a08f-961eccc693ae/33938901532.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/kuwed.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_062ff61700064c828ea7946a4164bad0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94b8288-62fc-4c9d-9393-cd1bdcbbbffd/does_my_directv_receiver_support_4k.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_472fb742bf084145ab74676b02bc1c70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e322efc0-be65-4844-ad79-3b71afee058d/alfred_piano_book_1a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc11b2d7-01d2-4fb8-9648-f38e51417ddc/how_to_install_focusrite_scarlett_2i2_on_pc.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/algebra_2_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf18c1b0-5cf1-4a91-abe9-94cfc456236e/97682944426.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_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 5340 bytes
SHA-256: 0f4d2d4b86f46e5029237c20786ae48cc3dd72590a52ab111af7c22ef59e5fd2
font_01_sfnt_off00013757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13757 11764 bytes
SHA-256: 45098fc9bd192ce18a2f69601c3c417cd269fc4ec42dd74945aa514ffab22498

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