Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbbe789367a0d0c…

MALICIOUS

PDF

93.6 KB Created: 2021-03-28 14:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 304be26ee5f93ee956edc30dc65c477f SHA-1: 11693ce3c89611e7ac7656c750b25994be32dcf7 SHA-256: 7dbbe789367a0d0c73a8faf0a2448fbf62115f6e884feaa8b9420c15660e622f
244 Risk Score

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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=2019+answer+key+scholarship In PDF document text
    • http://acupofjacob.com/napizobuzowujimevsg6v.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/vuduxuwavone_rodatinot.pdfIn PDF document text
    • http://tublitalia.space/2gig_change_master_code9ap5o.pdfIn PDF document text
    • https://kelasevu.weebly.com/uploads/1/3/4/6/134697592/8738256.pdfIn PDF document text
    • https://kogijusixi.weebly.com/uploads/1/3/5/3/135312463/xiparoguko.pdfIn PDF document text
    • http://vittorguxx.site/animated_icons_after_effects_freepovzb.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/toro_lawn_sprinkler_solenoid_valves8nwwf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/replay_ken_grimwood_franais.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_0b06c0814fd44f1e8312ab0a19da6398.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_3ed7a397ce0d41c48ba0e67e3541ca9a.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_f82c5840bfa34f7bbfa8e55a006fe264.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_4e13b8068b614228b27161cb79c3ee4c.pdf?index=trueIn PDF document text
    • https://f25535ca-33a9-4d84-83e7-6179260772f1.filesusr.com/ugd/be19e1_825e423959114facbc7faddf7f7bce49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0d3f88-936c-4e2d-9ea3-05c74b433a10/kjv_apocrypha_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ab3a42-13d5-4b63-8282-fa476f5c11e5/29127150699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21816851-a734-48f0-b247-7970eed75790/tilepor.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/suderiludo.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/brother_hl2170w_printer_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/macbook_air_keyboard_shortcuts_cheat_sheet.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_6c49c07efba24026a769a871effee3cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98175a6b-1ac8-47e3-8370-156fcdc6380b/moto_g6_manual_network_selection.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/67975836758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625894db-2c20-46f5-b5c2-c393f6e478a5/87832325318.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_e5645a83f72b46ee9025f2ed01ef10e8.pdf?index=trueIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 5664 bytes
SHA-256: 5fd1f46c790965b66449f0dd1b657aa7c647de9ecda309e39f05f7ed9025beac
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 3772 bytes
SHA-256: 13f1c1acb04f6a2c0c7809b473bb32c2578594c6ef10021f571feb2e59bba7cf
font_02_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 10956 bytes
SHA-256: 9e43ae04794718b4b3c75ff26a1916da67bfc2ad4553a970b079783c4b06317b
font_03_sfnt_off00013d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 13860 bytes
SHA-256: db8b4e7f18c198e3f74b42ebae6008f134f89f6a551e619427228b5559bcfb1b