Malicious PDF — malware analysis report

Static analysis result for SHA-256 da96b04c4c2621dd…

MALICIOUS

PDF

86.3 KB Created: 2021-04-13 20:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed66eb6e036ff1fa242c2dea7327eb1d SHA-1: d4d2148c5607f46e6a9c2e5b2f45d0bf18cb2936 SHA-256: da96b04c4c2621dd5357b023efa4a02fd8604d256499d84ecd28127980c5e13e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=how+to+make+cheese+fondue+in+fondue+pot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384035/normal_6066158e328ac.pdfIn PDF document text
    • https://wudumimimi.weebly.com/uploads/1/3/4/3/134356267/xusebuma-tefizu-velosez-julexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6021098b65fe9.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/9545524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_60559184d96f0.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/suzobejupuzox.pdfIn PDF document text
    • http://supanigavig.iblogger.org/xoxifin.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/809f76c9da734d.pdfIn PDF document text
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/871099.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/838c752e-0984-4e57-9e29-55f1b09deac0/96037907650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933b2755-db5b-4795-84ca-467dcbfebe48/mcgraw_hill_answer_key_geometry.pdfIn PDF document text
    • http://babokad.epizy.com/how_long_to_oven_bake_hamburgers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08268ee0-5b7b-498d-b119-c13f55a10239/57629398203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3145fb78-f892-427c-aa81-93172996524e/xuwisidapodulelef.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_caeebad749f04e199b92a6aa6820b417.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_d9f63cadd9be4f6d8bb72c2ad378c3f1.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_a8faaee00cfa420fbfffcafe46cbbf52.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_966299dbc11f48f7a309af30d78a9a65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4271ee5-737d-4b8f-82ef-f3a6ff3cb3be/78322223275.pdfIn PDF document text
    • http://karedewig.epizy.com/zivetetilufeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b052190d-4da6-479f-9713-988b5e33931e/how_long_does_a_maytag_bravos_washer_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ff4b05-ca85-4ff8-92a1-5cb068c1f331/78374595907.pdfIn PDF document text
    • http://gevewodex.epizy.com/82237441077.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_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 5264 bytes
SHA-256: 28c290dbc6407621867935b91bbbc65f833f8e462e88b59c82ad563ae9a18f81
font_01_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 4468 bytes
SHA-256: 719436665c2bf0285e6c8bbf879f4d8da822b65c6a29d4da41bc1ff79ef2fa78
font_02_sfnt_off000117e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 10876 bytes
SHA-256: f89dc6b493cc110ea0bbb2275ed8648fe1aced09cd0b65f8d716634d8bdbf261
font_03_sfnt_off00013d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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