Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbc89ceea778654…

MALICIOUS

PDF

86.3 KB Created: 2021-04-16 02:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a8d31438c236fef81a4683ca1c4c7f0 SHA-1: 1f3ef3504cb7b2320401f82ea98e661dcd1fc5ee SHA-256: 3bbc89ceea778654389768368d77ab487a6fcdd4bf86d88512a7f13c774d7c41
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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.
  • 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://ponafet.ru/strik?utm_term=joint+probability+examples+with+solutions+pdf PDF link annotation
    • http://fumegowo.iblogger.org/62786643611.pdfIn PDF document text
    • http://bufosizodibe.iblogger.org/99702110451.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/igdhghd/contact_lenses_color_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/ijhaNs0/foster_parent_appreciation_card_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/76jcPB1/kalah_mancala_board_games.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/4dxbxcD/knife_sharpening_stones_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/jbjaqhf/pisasavele.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_9fde0acffc9b415d87ef40b3af1dc0d8.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_b6b605a610c84c67bfab15146bce61bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3029caf4-7e29-4942-af00-f77e2e58abcf/26149337606.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_93b81ba05cb94c1ab0c98b1eeb16916e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45460259-5eb2-4c6e-841f-350ccb78d925/spanning_tree_protocol_state_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4680bbe1-28bd-44ff-aa62-d96e96f8b80c/singer_athena_2000_electronic_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd4cf21-9949-456b-811d-baa5dac870b7/9642504252.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_5f64686bb7ba4e7797862baa1e676124.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e635e1-acf4-42be-9301-8eeb7b93dac3/gowidatujunubenas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b542928c-f0e3-4e44-b9f8-a1316b128598/how_to_setup_dish_network_on_2_tvs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b60d12b-642f-4043-965e-ba69a061dd3d/mesa_de_som_yamaha_mg20xu_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12fd1a6-cffc-4ce6-8c3d-8369d42b1549/how_to_change_battery_in_cateye_velo_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe541898-2292-4c3c-a785-e0f75d27a9aa/29371621595.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/1595714060.pdfIn PDF document text
    • http://valaweno.rf.gd/the_eight_biggest_mistakes_investors_make.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_e2697ea0e8d84883aaaeb1a3143744e3.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_67bd48ddd03d4fbaa14898d3346b06fb.pdf?index=trueIn PDF document text
    • http://damatagowigiz.epizy.com/buspirone_davis_drug_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 5672 bytes
SHA-256: 17a0757df167a1f3eacb34fac72e1add74788ef669d0aa08c909502b579f12c0
font_01_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 11944 bytes
SHA-256: 61e83ec6ea49bc68bb447c3d30de42da145e7d9eb9e5ec52f417c30beb207569
font_02_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 16116 bytes
SHA-256: 70f0567fb573f7cbb01cb687948de103a4b330d0fc441c0607dc3349f8c22622