Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b862c002a75a163…

MALICIOUS

PDF

83.6 KB Created: 2021-04-20 03:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 313a2e5dd0df3e2ce4d4dde66aeadd09 SHA-1: 7c3ef116a5c8b0ff2301e276f6e0508b76b005f2 SHA-256: 1b862c002a75a163a5326fa07fe21bac06b6289675dd19fa1737e7908c0ce88e
126 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that redirects to a suspicious domain, likely intended to host phishing content or a further payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for malicious links, and the ClamAV detection confirms the malicious nature of the file. The document body, though heavily obfuscated, appears to be a lure related to a common household item to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=why+does+my+singer+sewing+machine+keep+jamming+up PDF link annotation
    • http://wigogaduxatinuv.iblogger.org/kovojiwofaxo.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/jenkins_dotnet_core_3.1.pdfIn PDF document text
    • http://bixekakazozerol.mywebcommunity.org/how_many_carbs_in_one_jiffy_cornbread_muffin.pdfIn PDF document text
    • http://vojakebuniseti.22web.org/siwoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_ae4795f575574a7e83d3ddbd62db9e76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/music_distribution_contract_template.pdfIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_8480067fcc1042d6b462736e51caedec.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_293aace35e834838b40cdedae19b7fd6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zugutixe/python_flask_jinja2_template.pdfIn PDF document text
    • http://wubalele.rf.gd/51940224779.pdfIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_b93464960b8e4f098cd2865fbb432fb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/sukuxi.pdfIn PDF document text
    • http://sijugisuvaf.epizy.com/bunevobotajeritekisupa.pdfIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_0bcdf878ff5e43f5bd2a3c8728a8966c.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 5800 bytes
SHA-256: 119823fe80fbe9a04e6820e49b2c6c51bda0bc561b8a22da6958cb5779d36dd0
font_01_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 10796 bytes
SHA-256: 5bd4cede667b6c19567b5cbab0e1246db569d8d2ca793d5b99729fe8a10545f8

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