Malicious PDF — malware analysis report

Static analysis result for SHA-256 c880d6f092fde0c6…

MALICIOUS

PDF

77.7 KB Created: 2021-04-15 07:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 528d36f78db87e9614885f863956f7d0 SHA-1: 93d4c353343efa3e413ad30b2a0ec65aba5b02e4 SHA-256: c880d6f092fde0c69624520606dcfd44f6cbb864d6394ea87a6cbc7ac38b6b4f
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content or phishing sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=charles+bukowski+poems+quotes PDF link annotation
    • http://laribij.scienceontheweb.net/ansi_relay_codes.pdfIn PDF document text
    • http://rmk4sale.xyz/washington_post_crosswordrx4r3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_603a41f9f0825.pdfIn PDF document text
    • http://dadosib.22web.org/zezemekisunogok.pdfIn PDF document text
    • http://nalobuberejiner.iblogger.org/19526618863.pdfIn PDF document text
    • http://pilinopumewaza.mywebcommunity.org/95306320489.pdfIn PDF document text
    • http://gazozaxuk.getenjoyment.net/28942209731.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/jump_ball_hop_on_color_block8flz3.pdfIn PDF document text
    • http://vijufik.iblogger.org/zanokulodigajojax.pdfIn PDF document text
    • http://jarokixepoweso.mypressonline.com/8070321125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_60548eb140dc1.pdfIn PDF document text
    • http://pijojavoto.mygamesonline.org/76592856838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://durakukulutozar.epizy.com/mathematical_modeling_project.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_7db9d596a7c348439486afde23d43e23.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/zewomo.pdfIn PDF document text
    • http://dupumimegijema.epizy.com/57803790569.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_df83e6ce05a2443d98f3eb2ea25115bd.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_30d9dff2169f4ee998a04c213c5630b5.pdf?index=trueIn PDF document text
    • http://vewawisu.onlinewebshop.net/baby_registry_checklist.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/gokugadosibanuxug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5388 bytes
SHA-256: e5b13d763ff73130cea9d563f9a6daaf792fcfc9b47e4864e50c5630580fc79d
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 11028 bytes
SHA-256: 096594509a286b9ec52d2a037155b616527360ffceddb2901b89cc9a22b9251b

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