Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef48995e03a84442…

MALICIOUS

PDF

71.2 KB Created: 2021-03-05 00:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f7789ad850da15f2968ea7fda9682548 SHA-1: b2a99165e81a58fa8be27a2b2ba2b4bb4cc436e1 SHA-256: ef48995e03a84442cc685fc25d594864db223fb12359c48a552c470dd6761446
226 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 distribute malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a fake browser update or extension, a common social engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via JavaScript or exploit a vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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://kuzutuzo.ru/wix?keyword=the+hundred+dresses+pdf+download PDF link annotation
    • https://dufebekeromodi.weebly.com/uploads/1/3/0/7/130776386/xejajawufasipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503767/normal_6026263690e7b.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/gipaguwabap_lixix_pikojegape.pdfIn PDF document text
    • https://gizipiwiro.weebly.com/uploads/1/3/1/4/131454158/vopejobegijupabaw.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/4866188.pdfIn PDF document text
    • https://tupetemen.weebly.com/uploads/1/3/0/7/130738754/jiladijawa.pdfIn PDF document text
    • http://alkostore.xyz/power_transformer_polarization_index_testkkrwz.pdfIn PDF document text
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/nugemuvosu.pdfIn PDF document text
    • http://jizefuli.22web.org/organic_flannel_sheets_canada.pdfIn PDF document text
    • http://websporizle4.com/tugunadiwenapatekorinw2ldn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_603c014dc51c9.pdfIn PDF document text
    • http://allroadkamchatka.ru/java_beginner_cheat_sheetzhdbj.pdfIn PDF document text
    • http://bet-info.ru/great_cave_offensive_treasure_guideohltb.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/b1a1f17f-aa1c-4bf0-be34-4e6ce5599aa4/fitbit_flex_2_bangle_silver_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbd4f42-f713-4a33-a91c-eaebccf7e2d2/fuwetibodaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ab09f9-1efc-43ba-8c22-1e4c56a862d5/starbucks_hot_coffee_travel_cup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54a4eea-07d7-416b-9b38-ba9a2073f76f/what_is_the_strongest_denture_adhesive.pdfIn PDF document text
    • http://tepoguko.epizy.com/lisejezativisutipirada.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/baba_is_you_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef8ea2e-28a5-48c7-a33d-bcebfd85e310/fejoxeditasamuzupo.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_off0000cef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 4924 bytes
SHA-256: cf8d04d804e432e90862290c733d2f70b486fa239711445c320b4ec81a60d085
font_01_sfnt_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 9912 bytes
SHA-256: c03d2d868e1e84b2ff19ab6f38c4f92f4acdd34f0942d56a5682695ad175b368
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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