Malicious PDF — malware analysis report

Static analysis result for SHA-256 121443f49804c0df…

MALICIOUS

PDF

80.2 KB Created: 2021-03-27 16:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a535f664a8c6b2d774e100886073df7c SHA-1: 5133ea0a548e60de2bada03f2cd536d08ae81ef1 SHA-256: 121443f49804c0df091da79042531ae0ac66b3d86e023519beaed0b9cb450909
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 0.9967

Heuristics 6

  • 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 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://ponafet.ru/123?utm_term=macmillan+collocation+dictionary+pdf PDF link annotation
    • http://tryne.xyz/axcrypt_1._0sk1lz.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/fdijigI/descargar_block_strike_para_pc_2019.pdfIn PDF document text
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/taseb_rewukusadesa_pefola_zasinapujo.pdfIn PDF document text
    • https://cdn.sqhk.co/rowavarop/jfhjfyG/susogotujix.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/dhgddjg/95730213864.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/1e4b85753.pdfIn PDF document text
    • http://yoganchik.space/72739334281xjg8g.pdfIn PDF document text
    • https://zijoganidilo.weebly.com/uploads/1/3/1/8/131856317/fixamasusaz-sewerobov.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/5109392.pdfIn PDF document text
    • https://jutarufuro.weebly.com/uploads/1/3/0/7/130775772/bosiruzugiwaro.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/1ec07b733e1d.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/be5081a6183.pdfIn PDF document text
    • http://whowill.ru/weber_genesis_ii_e-310_natural_gas_grill_blacktz94s.pdfIn PDF document text
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/balurabu-gaduguzibeku-mumawu-sijosovunofefa.pdfIn PDF document text
    • http://tibetterrier.ru/39936508406jcod7.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/b4Wpjcn/swatch_watch_80s_ebay.pdfIn PDF document text
    • http://leyloften.online/69219941903kdogz.pdfIn PDF document text
    • https://jaduvobawitirok.weebly.com/uploads/1/3/4/3/134398576/c1d4d23ed3378.pdfIn PDF document text
    • http://pubgucbayim.com/nutrition_taco_bell_taco_supremeem1at.pdfIn PDF document text
    • https://kenomuxi.weebly.com/uploads/1/3/4/0/134042647/filowaluvexasinove.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/Tib0ijT/descargar_pixel_s_unknown_battle_ground_hackeado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_4bfac8cac2f54a84bbb50e55fc3a3c82.pdf?index=trueIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_294d6f8bc0aa4aaca1b20f7fa2c3c77c.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_a35154ad8380403489553db55340e3db.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_63ffdf4fe0de45edab710ef486558ae8.pdf?index=trueIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_30af4babee5145bd89555a65a0cf2b02.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_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 5228 bytes
SHA-256: 9cb029b0836b2c3ea6ab5ddc9775a35dac6e82a28faa294cb67a88439663d306
font_01_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 15212 bytes
SHA-256: 08abc6a83b9905213cff914af8e6a32fca05ad6fa64e5dfdb0b3527952470be6