Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b709dafb54881b4…

MALICIOUS

PDF

81.2 KB Created: 2021-06-14 00:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d7738a4eb24948e703c7ffb7c24c1a3a SHA-1: 50fe3d39d50fe6bcb4fe00ab654c625732be8580 SHA-256: 9b709dafb54881b4a71a642c62686092ad499881a2ebbf8342e71569904a3f2e
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 0.9998

Heuristics 7

  • 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 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://gimoguvi.ru/123?utm_term=android+studio+gradle+project+sync+in+progress PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420018/normal_604e73a098e28.pdfIn PDF document text
    • https://dakuwiremab.weebly.com/uploads/1/3/4/9/134901294/3574564.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/kemakarevazagil_vubegekaxe_wumitu_xepemexemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_6018c45ddf2a9.pdfIn PDF document text
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/memiwunibalapil_vupunelit_gedukigunusuxow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_601690b668591.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/dovirilanota.pdfIn PDF document text
    • https://navubuxodogonid.weebly.com/uploads/1/3/5/3/135327143/madofekowewefuwulixu.pdfIn PDF document text
    • https://nakubiwakuja.weebly.com/uploads/1/3/7/5/137511820/7886070.pdfIn PDF document text
    • https://lamegebepezaris.weebly.com/uploads/1/3/1/4/131438642/vixobezifutagedafu.pdfIn PDF document text
    • https://jopepikenaz.weebly.com/uploads/1/3/4/6/134652119/mojijatadivudat.pdfIn PDF document text
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/6095ba15365.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugozamuxika.pbworks.com/f/pssa_training_quiz_answers.pdfIn PDF document text
    • http://gugatodoka.pbworks.com/w/file/fetch/144922854/mardaani_2_full_movie_watch_online_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8f9b00-4110-451f-a243-157292de5054/polaroid_iso48_firmware.pdfIn PDF document text
    • http://lefilep.pbworks.com/f/93884581176.pdfIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/145176387/past_simple_and_present_perfect_sentences.pdfIn PDF document text
    • http://febigadeviti.pbworks.com/w/file/fetch/144766824/10932000944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a1c961-cd6c-42d4-8fc2-95ce098cbc03/29374830223.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 5408 bytes
SHA-256: fab9d0aa3bc4a357372fa65377be92f6cd012a68a75fb17b7aa94adacfcb03ca
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 15288 bytes
SHA-256: e9d28c1f99e757b1b83ad0036f6332a7cc8eead59e89fb309caa5344cb54e4d2