Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e86408cb0f04ce…

MALICIOUS

PDF

170.1 KB Created: 2021-04-03 11:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 65712ad5e2eb9d0e8226858a09a12cdc SHA-1: 50aa098feffc36af01ab43713053c8623ae968b4 SHA-256: 85e86408cb0f04cec55c2ee769c780f32b12d71b0ee05f84742bf8b78b549751
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 0.9959

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://zajinet.ru/wix?keyword=genki+2+second+edition+textbook+answers+pdf PDF link annotation
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/5848630.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/7902d.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzonoviza/gjhfjiY/voice_recorder_software_free_download_for_mac.pdfIn PDF document text
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/1282481.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/djbii5E/76973048807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_6024fb8a063ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489264/normal_60396599cee22.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/cXjcjhq/902546397.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_a1c23dd354ef45ba8f98cfa1389ab3a3.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_b95cabbe0c9041799b2d2b822ed8d1f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/gepevukoxoliguza.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_feb497ec5a7c4310a3ff0d2217f4ba10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4774d8f0-dd94-448d-ba00-bf3cdc82df67/how_to_make_dough_in_a_bread_maker.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_6ece09dc78864aa1af2332140ffcc16c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/12812237075.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/32195630685.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_e03c4da98d6347eb88cabb5ace0591e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5780c76-f9c1-4863-871f-639a93eb1c04/the_standard_401k_rollover_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4baed57-4359-454a-ab38-d3edc07bea03/frigidaire_1.6_cu_ft_retro_mini_fridge_manual.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

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 3408 bytes
SHA-256: 3e06413a414c12732327dcf355bb741417fe023f911285c6fcd2271442ece864
font_01_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 96640 bytes
SHA-256: baf5d74a863c6b1113e6efe5ca867b3c9dc29bd8403ba3c38799538d0097776c
font_02_sfnt_off00024950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24950 5432 bytes
SHA-256: 7e76b31651f68d9acf02e60e4a870fba69d7abe56c218fd85e48b1f55fdc42fd
font_03_sfnt_off00025be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BE1 2048 bytes
SHA-256: ac563f1180543c9f4d9b102108afa0e0941b2fd4f199aa08af3cddd05ca1801a
font_04_sfnt_off000264bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264BD 11684 bytes
SHA-256: 355c21dabab6a4ab5c8ca254d3f149a2d2152470c32df29bcf0e754980117abd
font_05_sfnt_off00028c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C8A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3