Malicious PDF — malware analysis report

Static analysis result for SHA-256 d763465ca70a529c…

MALICIOUS

PDF

78.6 KB Created: 2021-03-07 11:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f678ff8390274bc772500b159398f011 SHA-1: 8bb2f91e8cde53e7278a3933cd55bdf5a127e68d SHA-256: d763465ca70a529c76eb6158ac2130d78665e3d1cccb9a345e57807a989a0352
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on disposable domains, a common technique for distributing malware or conducting phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content, likely involving JavaScript execution for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=cool+easy+sketches+step+by+step PDF link annotation
    • http://talakam.space/xfinity_tv_app_errorqevnf.pdfIn PDF document text
    • https://mirivibi.weebly.com/uploads/1/3/4/2/134234555/fc7cab3d1e61825.pdfIn PDF document text
    • https://xebudaxuzab.weebly.com/uploads/1/3/4/8/134872147/gexepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_603169d2ee8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_5fd1f4ecdcdee.pdfIn PDF document text
    • http://cancandance.org/blobby_volley_freewvfs7.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/c54b9ce8344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc64b5d7c26f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5fcf8064b333d.pdfIn PDF document text
    • https://fenatinuzari.weebly.com/uploads/1/3/5/3/135314561/xodawojodim-rojuxim.pdfIn PDF document text
    • http://megatorg.ru/crazy_climber_arcade_cabinetdbgh7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_6035d0e4a170b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fce50057b686.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/befini_lulenutalu_libeweguz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5fe473e2ec910.pdfIn PDF document text
    • http://lakcherie.ru/how_to_turn_off_demo_mode_on_panasonic_inverter_microwaveggbgp.pdfIn PDF document text
    • http://stepka2016.xyz/how_to_pair_bluedio_t4_turbine_headphonesr9h94.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/fobixelol_dezodun_kodusuke.pdfIn PDF document text
    • http://begdas.fun/a_discovery_of_witches_season_2_cast_gallowglasstvmok.pdfIn PDF document text
    • http://tk-time.site/adobe_photoshop_elements_2020_manualkvf0m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 5136 bytes
SHA-256: 7786957b547029d84fd2bf53b6c3d9c103b03e46315c9d54d114362f88891837
font_01_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 10408 bytes
SHA-256: ea6c96938484cd137c1995851435405519f0c6bd72d1c7368028983d39e8a687

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