Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63912d3e14440d0…

MALICIOUS

PDF

127.5 KB Created: 2021-03-15 15:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12e8f377bacf39eb0ccd4a2befeaf3cb SHA-1: 243dda95efffb04ca9eb830d4056764b87bd2e4b SHA-256: b63912d3e14440d0482522cddc53e190b7e06341f2b15788b62bb08226baebeb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' suggesting it's part of a link farm operation. The primary URL, 'https://resalured.ru/wix?keyword=far+cry+2+trophy+guide', appears to be a lure for search engine traffic, directing users to a collection of other PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=far+cry+2+trophy+guide
    • https://cdn.sqhk.co/tuwesedujila/dijDhfp/steam_tools_mobile_app_confirmations_menu.pdf
    • https://cdn.sqhk.co/tekunipifob/f1zohgQ/buxatakurifuvebipi.pdf
    • https://sexaximelukifa.weebly.com/uploads/1/3/1/0/131069869/xegosevanobebojuf.pdf
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/6403481.pdf
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/b413b4cbf.pdf
    • https://gobunelesivuwol.weebly.com/uploads/1/3/2/3/132303092/rokepugi.pdf
    • https://zuligaxexepe.weebly.com/uploads/1/3/0/7/130775912/2927738.pdf
    • http://kivudutamazawan.22web.org/aladdin_2019_songs_320kbps.pdf
    • https://cdn.sqhk.co/nusuguponu/VUha4o0/nemutibi.pdf
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/237828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8c9f0ab5-7b24-4992-b0d9-77c62f4b46da/slingbox_500_power_supply.pdf
    • https://uploads.strikinglycdn.com/files/d4feedef-fd2b-42dc-bf24-8214b49a3b9f/2579165465.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_8601da9b8fdf43aa9162f9c7289cc8bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d698fd29-c329-47f0-9c19-94150f1b7d26/60527518005.pdf
    • http://lumipanu.epizy.com/wuronukilebudopuravom.pdf
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_b932a1d591bf4c33ab9279d8db1d7e43.pdf?index=true
    • https://uploads.strikinglycdn.com/files/57694682-fd76-43df-8aa0-b4173d435ec9/comienzo_curso_escolar_2019_madrid.pdf
    • http://pilezipiluzoso.rf.gd/95296359204.pdf
    • https://uploads.strikinglycdn.com/files/a5111257-8f19-4600-9e1d-fafd8a2cf861/86901818561.pdf
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_5e70de8f5a2e46df97b8706a8b7cc911.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b861.bin
80cf96c9b9f6b82fbd39a088ca4c9425e88454a57c591a761228d07a07b592a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B861 5312 bytes
font_01_sfnt_off0001ca7c.bin
057611149acc4c5c4263fff4cf8152b1cd26c07d36cf7a61850f6c21ba550b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA7C 11128 bytes

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