Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e2b6266387ca3f…

MALICIOUS

PDF

83.2 KB Created: 2021-06-10 09:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a41098719e6b13b019f3f94954b92eaf SHA-1: d11bf3017df31096857ed843e569c5332103a95d SHA-256: c0e2b6266387ca3f5e868c22d2c50611245fc6daac030f06f2ec7d87161bb73a
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate a lure to install browser extensions or plugins, a common social engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zajinet.ru/123?utm_term=opera+android+adblock+not+working PDF link annotation
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/jusugivoxisulosobim.pdfIn PDF document text
    • https://belibezininu.weebly.com/uploads/1/3/4/8/134850089/6109190.pdfIn PDF document text
    • https://jiwazakamofefuf.weebly.com/uploads/1/3/4/0/134041011/kidomaridoz_sirepija_zojep_jidefeko.pdfIn PDF document text
    • https://fexemefamerera.weebly.com/uploads/1/3/4/2/134236105/ef59dfbe919c7.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/1027844.pdfIn PDF document text
    • https://folugaso.weebly.com/uploads/1/3/4/5/134503816/d2e20.pdfIn PDF document text
    • https://batebabegusuk.weebly.com/uploads/1/3/1/4/131437625/pejiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/64227854-4750-4f5d-8854-ae00d3ae03be/what_do_i_study_to_become_a_real_estate_agent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506f02ad-ab60-4bb5-a293-ecadd4366f85/wawavodawuwavikigakukax.pdfIn PDF document text
    • http://ranetowunose.pbworks.com/f/is_hypokalemia_a_nursing_diagnosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bd4441-48a4-49d2-8309-e90e63302779/voxabisaraxorudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423a2072-adcf-4fa0-92d1-ed3f36838986/wubukirilovupesalus.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/w/file/fetch/144498852/poritelovav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00752ef1-3c3d-4a2d-b1be-b087e83b1378/small_pro_keygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1c255f-1279-49be-873d-74eec29a8dca/sovusopumaritiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dcb1a0b-30b2-4f45-b3c8-d23ed94bc99e/temomojizilopokanaxa.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144630810/xafujivulaburubizesedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128ee103-bf6d-4ddd-b45b-5585e61548fa/bevorajime.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/f/monkemeyer_metodo_per_flauto_dolce_soprano.pdfIn PDF document text
    • http://wenumizelug.pbworks.com/w/file/fetch/145018809/one_page_phd_research_proposal_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76395428-8323-4d45-baf6-80f9bb7204fa/96906408913.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 5176 bytes
SHA-256: 1624d153959678e38d252e64ddbbb0fb58f28d5b6d798cc10b346cd9733d974c
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 2484 bytes
SHA-256: 8085e85f7ab2ec424f2d1e8603e5adaf13eeac0702cda241d6a7218dd8b8c71c
font_02_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 11064 bytes
SHA-256: 0aecbe94d721278239e705aaf467af095383308536f48dcbda7be04a320bbec8
font_03_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378