Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e190f2212db4fe…

MALICIOUS

PDF

77.2 KB Created: 2021-05-06 20:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f4e3e71e1319eaad0e9029a8f23a1701 SHA-1: 2173f9cf93b505b8009d07165163fea20708e857 SHA-256: e2e190f2212db4fe10675f82c2caeeebbf34b0ba6fba4d6b33bc6f8d0be171cf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=arduino+starter+kit+book+download PDF link annotation
    • http://fortuneo-enligne.com/2605283891llzgz.pdfIn PDF document text
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/1235634.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/ojjEjjb/lenovo_ideapad_flex_5_review.pdfIn PDF document text
    • https://zovoxokovu.weebly.com/uploads/1/3/5/9/135957880/6410660.pdfIn PDF document text
    • http://wacc-cat.org/zunizobezetejolekx9ms.pdfIn PDF document text
    • http://storezone.info/buku_agama_agama_dunia82ib0.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/gE4Vnql/zalutaxus.pdfIn PDF document text
    • http://leyloften.online/40220375581z8jxv.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/7733894.pdfIn PDF document text
    • https://cdn.sqhk.co/bularalunop/fjiXgcD/matrix_live_wallpaper_windows_10.pdfIn PDF document text
    • http://figupatofewox.iblogger.org/irs_exemption_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/clcihtK/84813469665.pdfIn PDF document text
    • http://nasty666.space/738881115215v3i8.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/n8QhawP/pobojipurawuf.pdfIn PDF document text
    • https://makigutezun.weebly.com/uploads/1/3/4/7/134707077/rijipifugo-pexumuju-xotanupofijeti-dugidiri.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/406bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapesuzimu.epizy.com/definition_of_antenatal_care.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_e750d031923e4a9c901003cc4aad5f29.pdf?index=trueIn PDF document text
    • http://gilasorizarer.rf.gd/how_to_measure_a_stihl_chainsaw_bar.pdfIn PDF document text
    • http://lepugip.epizy.com/78035561009.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_9caf7106f78b46e9b58e96cf1ccf60c2.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_b89af89c55fc427b86b7573713146f84.pdf?index=trueIn PDF document text
    • http://sixuregorajaso.rf.gd/static_gk_capsule_2020_gradeup.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_2a43abb2c6404e7d955846b73084bae8.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_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 5104 bytes
SHA-256: cf068b55295ce40b3ddb7f54617affa15d5841f89eb8489ec68e95ba68b2088e
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 11124 bytes
SHA-256: 74ef2411983268ddf0bdcc90b388e8ac6e6a28e8c54c58be3879016aba020e39