Malicious PDF — malware analysis report

Static analysis result for SHA-256 735f61141b96029c…

MALICIOUS

PDF

84.2 KB Created: 2021-03-21 21:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 35820d8334835486d03ea84b0c5f8030 SHA-1: b1bd5f33b94cefbf8b9d7684b2eeef13db0c4496 SHA-256: 735f61141b96029c2d8c80e544b5160f6a98fe6ab9559f0f9898225be3a63898
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://botokaw.ru/award?keyword=fundamentals+of+computer+graphics+3rd+edition+pdf PDF link annotation
    • http://mon-compte-cmb.best/37699354132y39el.pdfIn PDF document text
    • http://zukoretevir.medianewsonline.com/50022702278.pdfIn PDF document text
    • http://changely.club/cuanto_es_100_gramos_de_azucar_en_cucharadas6q7bf.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/27548232988.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/iata_city_codes.pdfIn PDF document text
    • http://thechambre.xyz/269065020203c68e.pdfIn PDF document text
    • https://muzobaxokeze.weebly.com/uploads/1/3/2/6/132682229/7296310.pdfIn PDF document text
    • http://how2clever.com/1168419894248ypb.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/swedish_massage_routine_full_body.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/panasonic_sr-df101_fuzzy_logic_rice_cooker_5-cup.pdfIn PDF document text
    • http://srakan.space/72773429834nv1yt.pdfIn PDF document text
    • http://afracheat6.xyz/joboxanurusog8p0x.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/gelafudenixi.pdfIn PDF document text
    • http://tesocoin.online/62759277478qmr35.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/a583d362-ad82-45c9-8625-1e930c149a3d/evenflo_platinum_series_car_seat_replacement_parts.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_b5bcc407547f4eea9d31ece01868d358.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/659ee7c6-6dbe-4fe0-9944-db5a65cae008/how_to_program_directv_remote_to_receiver.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_6483fbb0ab564e74bb79d99be556dab1.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_69fe72ef288e4544ba680cb35e6e7e59.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_4b2c67813e954e9cb8624fda5cd40b73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8828c4-29e8-4746-9de9-7b5e7c806ccc/plan_de_negocio_de_una_cafeteria_pasteleria.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_c4ea403db9be413286af5fff6ef2e273.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000127ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x127AB 17740 bytes
SHA-256: 9fbac94ac88f4964036fb4ac0be3a0b4a3ef59c1a0e2e40dd201fab63daf070e
font_00_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 5688 bytes
SHA-256: e91f253ffb81bcdbca9b2b9e8434f41b1eb9cb899140b3cd5e492e1373b0f7f7
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 11172 bytes
SHA-256: 88d4faf1a6174549f939873feb4b3118d8c1b30815a7ba17d2d2c37d2c17e987