Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66a2b1f23e04b9e…

MALICIOUS

PDF

76.2 KB Created: 2021-04-29 06:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: daff7147ad66bc0b6593248746480ac0 SHA-1: 72a7637fceacd2f4082303d65ee9377d8ce87908 SHA-256: e66a2b1f23e04b9e895bb3d06180a9c6755f88279fd8a3af044fc30d69836b0d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 5

  • 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://dafemum.ru/strik?utm_term=sena+bluetooth+20s+evo+review PDF link annotation
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/5953853.pdfIn PDF document text
    • http://registrat.space/564706305467dd3c.pdfIn PDF document text
    • https://lusabosebab.weebly.com/uploads/1/3/5/9/135972845/zovef.pdfIn PDF document text
    • http://aycotoro7.xyz/dupimupimonuwesabafamaitpu1.pdfIn PDF document text
    • https://xebudaxuzab.weebly.com/uploads/1/3/4/8/134872147/6e984627.pdfIn PDF document text
    • http://rkconstructionsucks.com/piruxeliwejelymn3e.pdfIn PDF document text
    • http://zofiziz.getenjoyment.net/polar_and_nonpolar_bonds.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/maxujigesuburaniramozam.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/61101655164.pdfIn PDF document text
    • https://luselovuxetox.weebly.com/uploads/1/3/0/7/130739290/fusojoguxuzuja_bujodetupavo.pdfIn PDF document text
    • https://nekizazewovira.weebly.com/uploads/1/3/4/6/134627499/kolovezifukeral-jagabi-vawedaj.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/279ce22653.pdfIn PDF document text
    • http://medway24.com/epson_stylus_nx230_manual_wifi_setup7x8ot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_ec5c499ba24545cda90bb002513e0dd9.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_e501191bb39e43b48338365cde37da59.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_d0ac22f95aea4d828841993094624c4d.pdf?index=trueIn PDF document text
    • https://0face946-3507-4f1d-9804-30df5ac990e4.filesusr.com/ugd/8dfcc1_b18bae0ec5614ce5b1ea83064052c966.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_819f0775073343ad8233242fdc735634.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 5444 bytes
SHA-256: 9b037da0326e9d2ee7c6d649194da268a70f8862f021a155586d105034691489
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 11276 bytes
SHA-256: c3b5f945e0fee860a710037077d8e649ed84aa7868603624af2074477e9cb5d6

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