Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a5c48018e48284…

MALICIOUS

PDF

80.5 KB Created: 2021-03-19 09:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0562959f6922d13b926ee5f0dafda7dc SHA-1: de3c3a6f4fdf4911043d479945ec99b245154b01 SHA-256: 85a5c48018e482841706eb73405de9b789a938ed28e6010b3e284ebe538af976
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 0.9994

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://kuzutuzo.ru/123?utm_term=pressure+ulcer+prevention+and+management+pdf PDF link annotation
    • http://komarovskii.xyz/how_does_your_body_recover_after_smoking7p4gr.pdfIn PDF document text
    • http://rawenspant.online/umarex_beretta_m9a3_bb_pistol9we4u.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/93487335118.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/powibovubunowuj.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/87077700038te3ls.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/korureputumosaburumulu.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/basic_ielts_speaking_free_download.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/67632276159.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/e17935db-3ccf-40ea-bd96-97dbfb047e87/whitebeard_son_theory.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_51a59433a04949d3a0e42b7bd2b28374.pdf?index=trueIn PDF document text
    • http://fusozevukatamir.atwebpages.com/the_witcher_season_of_storms_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc74782a-1644-4b72-9b6d-a49bac603c01/57279114551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5eab738-8ef3-4e26-9a78-35ba8dc4d5f8/banevotuxaro.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_c06d8d6cdea14a01b1b9e96354aed7af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2736ebc-619f-4b8e-a023-9f78b0fb4c12/what_is_a_topical_route_of_drug_administration.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_6aae8316a3324c89901635af1897c213.pdf?index=trueIn PDF document text
    • http://zisukuvi.atwebpages.com/xuxarobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8ee262-34d4-49dd-9ac4-0969999bcd00/que_es_composicion_dancistica.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/goat_simulator_pc_free_download_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05328176-b3b3-4437-af0e-c75565dd5e81/bozuxapefabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a2a058-52fc-4618-af8c-74f6f39a53ba/accurate_1680_load_data_300_blackout.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_335ccb661a3f445c87c77deed1533693.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_a8ae0c52e17e4c949891b703c07dbab5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 5536 bytes
SHA-256: 7e7dcc3ead94ed59600817c3958cf0c8b921731c6ec052834a3d78f024628ac3
font_01_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 10280 bytes
SHA-256: b27978f2a6f9c3d2db58df155bd611555abf8cb2cfa2d5cb296ea8b7c48647f0