Malicious PDF — malware analysis report

Static analysis result for SHA-256 a509af4213e9b0f8…

MALICIOUS

PDF

79.5 KB Created: 2021-03-05 19:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bc8c4c9fed0dd4410725885da68b0a5d SHA-1: 1395a5b5a6e3a04e3dc76f4e221b4e9c565f1464 SHA-256: a509af4213e9b0f885c6c36677752da413107699475cf7291301a4aab0b83df6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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
  • 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://leonvi.ru/award?keyword=salary+of+mba+operations+management PDF link annotation
    • http://miromawetibikew.mywebcommunity.org/troubleshoot_avanti_mini_fridge.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/how_to_reset_boat_bluetooth_headphones.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/s60_vs_s62_garmin.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/49557562321.pdfIn PDF document text
    • http://www19216801.site/motorola_arris_sb6141_lights_flashing9hgzr.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/whirlpool_wmh53520cs-6_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/b7jc1df/24251548932.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/sat_practice_test_2_answers_scoring.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/8gcfYje/45959858578.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/poxek.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/76643976432.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/bayliner_capri_1950_swim_platformusxux.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/why_is_printer_saying_driver_unavailable.pdfIn PDF document text
    • http://hotgirls.host/97519143115ki54e.pdfIn PDF document text
    • http://kellys.space/wugarokaxixudifoginebarvf1i0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f0e89131-c9b0-49d6-99ae-8c1d54783a21/42351370984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e1728f-781b-4f2d-ade1-67768689c9b9/komakuwulepiriv.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_96d85d745b4d4653a3f19f21b5058924.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32eb02b-2aff-43f4-96ab-4fe873280bff/letra_y_musica_del_himno_nacional_mexicano_version_corta.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_0cce3e17a1fb4de0a1ee472fad326230.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_6b88ed0b0c4f4b3fa200b9c55bdd5a24.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_3de08f3466de4e0f9e6d8915780b6e1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf224e3-65a7-48a2-9f6d-d38916d2a020/ikea_white_metal_bed_frame_twin.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_0298015e595d43e580d6d40ec2d0c740.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 5356 bytes
SHA-256: d729e65679e41d89f8755c359ff6cedc115520db167c83ff100089a93349b2d6
font_01_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 11036 bytes
SHA-256: 15a70c0ae7acb58d89cc2e67ac2dfac8f61adc72a20f7f67bd9c53db9a3ff0a1
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3