Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e70c4f24a8f804…

MALICIOUS

PDF

85.1 KB Created: 2021-04-02 09:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dc1d928955d8f1f0295c3fa2d089c857 SHA-1: 717161a0960e0a6eec49944746f8ca61530d6cdf SHA-256: 01e70c4f24a8f8047a891a4a4d005d5eb693378f2ac6d0a36367eeee686dfe10
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+reset+service+now+on+vw+golf+mk5 PDF link annotation
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/4119361.pdfIn PDF document text
    • https://kovuvewu.weebly.com/uploads/1/3/2/6/132695697/6f86e3811080d.pdfIn PDF document text
    • http://serovakarara.mygamesonline.org/pdf_to_powerpoint_converter_online_free.pdfIn PDF document text
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/jilebofu.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/25742276193.pdfIn PDF document text
    • http://mereritijazos.scienceontheweb.net/rutamixo.pdfIn PDF document text
    • https://jewinovezuxumat.weebly.com/uploads/1/3/1/4/131407424/tepenajujufoxeliso.pdfIn PDF document text
    • http://zatoboyvibor.fun/777093903036d2ab.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/bcicHZP/34711288245.pdfIn PDF document text
    • http://pelistens.xyz/fefilizafijury41.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://arfesopt.com/acute_renal_failure_classification0c5f3.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/jihhgh4/cooking_fever_game_free_download_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/perurulexi/dell_7010_graphics_card_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/lol_coloring_sheets_free.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_89fc39e1c28c43f0b64f8e1952bc9429.pdf?index=trueIn PDF document text
    • http://saboveliga.myartsonline.com/66856825076.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_504ed3b3fd96464bb971c67213e9f34b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/savebig.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_f6706f6216d5464caf12266622e4d959.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_afdb35457692447fa63f129f0f036288.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_2fba292f73ad445ea4d34b0ad1b84ae2.pdf?index=trueIn PDF document text
    • http://mulapoxe.onlinewebshop.net/buku_agama_buddha_kelas_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/kelimuvikezekuje.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_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 5292 bytes
SHA-256: f2ded0e80f3cdcf2ef9491b5f1b599c5b1da530f5e98d21fc7156a69014e6b34
font_01_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 11864 bytes
SHA-256: 2991f754baf99b6049f50037abac7febf7e8c395e6da57f13bb704e2c928a19a