Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcc6d6160ab946d…

MALICIOUS

PDF

81.1 KB Created: 2021-03-24 21:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da877e79431fe85f67cd51f2d0d32b0c SHA-1: 2913b1e149734526bb121d94da5f80ec72904b20 SHA-256: cdcc6d6160ab946d0c71a651bc5d0c7b14d79aea8a91ab558b631a12dd9d12f4
156 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 PDF files, suggesting a link farm or phishing attempt. The primary URL, https://xezojetit.ru/wix?keyword=ski+safari+unblocked+games+24h, is likely used to direct users to malicious content or further phishing pages. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=ski+safari+unblocked+games+24h
    • https://cdn.sqhk.co/rabataxuvax/NMpieij/46661636561.pdf
    • https://cdn.sqhk.co/togixulala/heAoqEx/34265864821.pdf
    • https://cdn.sqhk.co/vugujebeku/jia2agg/free_audio_equalizer_for_iphone.pdf
    • https://cdn.sqhk.co/nugegigoxaxe/Zjaieif/fringe_benefits_guidelines_malta.pdf
    • http://pukoruserega.22web.org/wonafitutetelunex.pdf
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/dexevipulopi-masexumepofota-migizokoj.pdf
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/7442118.pdf
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/ac1b521f9.pdf
    • http://fexodubavilukub.22web.org/aeronautical_information_service.pdf
    • https://cdn.sqhk.co/dolafita/jjHUOja/bonafezipawijuxe.pdf
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/vawewanagugakawisipo.pdf
    • https://fowifosefudewak.weebly.com/uploads/1/3/4/6/134699900/71aac52e96a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xegiwofune.rf.gd/30727690341.pdf
    • https://uploads.strikinglycdn.com/files/63d764bd-0218-4827-baad-3f22b1a3e074/ion_block_rocker_battery_problems.pdf
    • http://mazoted.epizy.com/63339925833.pdf
    • https://uploads.strikinglycdn.com/files/b1ad574f-737d-4e2f-9c11-f0312dde4bff/nebarusezinekoletadatixu.pdf
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_987b6b6e54b84c88bd0e081718565a70.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43b29c57-2317-4414-87de-d5f4d56b8c6b/56279237875.pdf
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_bf24ef8b81b2471b8006e7a930635e9a.pdf?index=true
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_0fde176bbe3446978535f0a501eb268a.pdf?index=true
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_3e99884764ef433eaf779ab58c917463.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9dd5a338-131b-4f3e-87a0-219fa7b69420/soxajerekaru.pdf
    • http://fukokikedusej.epizy.com/diwakijato.pdf
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_f535e3105a6e41cebba33fd4e6c0cd5f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa1.bin
e69982187ff9b72dfa6058bce9d6c2d2d624b1aa7f73c5b5c733020498184848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 5764 bytes
font_01_sfnt_off000102fb.bin
f47c8a47c8801262c36abe1f0f6c2ea8fb14834c9a0820003268c1c43c22f609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 11004 bytes
font_02_sfnt_off00012837.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 4324 bytes

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