Malicious PDF — malware analysis report

Static analysis result for SHA-256 3964aff09b6244d9…

MALICIOUS

PDF

153.5 KB Created: 2021-05-16 11:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 40b17d0ee8387987382b1b7724f90fec SHA-1: 6832e628c7e9133646edf6048b11e3e7463066ee SHA-256: 3964aff09b6244d9f7b79c879b95c8d5041bc5a61e81b10946395bb134ae2693
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm strategy, suggesting an attempt to distribute malware or phish for credentials. The presence of a 'download' button lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=introduction+to+probability+and+statistics+milton+and+arnold+pdf+download PDF link annotation
    • http://daating19.site/vowukemzml5.pdfIn PDF document text
    • http://brumbum3.xyz/xakozizok5ctd8.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/44730425686.pdfIn PDF document text
    • http://xipukob.22web.org/headlight_bulb_application_guide.pdfIn PDF document text
    • http://auto-agents.space/428562658846kvr8.pdfIn PDF document text
    • http://dojaligiwojop.22web.org/fractured_fairy_tales.pdfIn PDF document text
    • http://startask.ru/kuxekov2017u.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/8470588.pdfIn PDF document text
    • http://vulgargirls.fun/what_is_reliability_engineering_pptbab9u.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/kerala_hindu_baby_boy_names_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_60192e5469d02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5febb0bf261bb.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/73807050253.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/41190511543.pdfIn PDF document text
    • https://kapegidaboxisi.weebly.com/uploads/1/3/4/5/134527108/zesuk_zanufapesirit_mumizibupedef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zetewesejoj.epizy.com/microbiologia_veterinaria_nestor_stanchi_gratis.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/architecture_handbook_of_professional_practice.pdfIn PDF document text
    • http://misibinebob.epizy.com/distance_between_two_points_worksheet_with_answers.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/kifigoji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBF8 7772 bytes
SHA-256: 4b780cb221d58e11901e4e3e1e54ad739b0c922013a918aaeedbbf2da5755662
font_01_sfnt_off0002162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2162E 5572 bytes
SHA-256: 904693bf6b6b2d3432af479bc2a311ceda25562e324c30927f60d05fd62c576f
font_02_sfnt_off00022918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22918 13832 bytes
SHA-256: 72321dae324a5d3dcf6e507904ba0d0bd4ccbe6afef28aded91015d9094015ef

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