Malicious PDF — malware analysis report

Static analysis result for SHA-256 def71ca9e433fc57…

MALICIOUS

PDF

77.4 KB Created: 2021-04-20 23:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 31e17fe5d50b6b284ba0823839cf29ec SHA-1: c88347ee53a343cf4749b9d7bbb5e7cd30cf5462 SHA-256: def71ca9e433fc5713773f1dce3af61fc0792ccea497bc5994a0c6985d498367
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+many+questions+can+you+miss+on+the+driving+test PDF link annotation
    • https://cdn.sqhk.co/sivunukiwe/62ifua8/wound_care_guidelines_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/acsibkN/wosaru.pdfIn PDF document text
    • https://tazugusalasuxof.weebly.com/uploads/1/3/4/5/134581133/4aa374ab23bb75.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/2515368035.pdfIn PDF document text
    • http://jujudinopuloxam.22web.org/biology_lab_report_discussion_example.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/39312124866.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/81598688971.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/autonomous_car_project.pdfIn PDF document text
    • https://gowobokibisalo.weebly.com/uploads/1/3/0/9/130969305/8503548.pdfIn PDF document text
    • https://xonajababivoxo.weebly.com/uploads/1/3/4/0/134040492/fiwukefejimulufurul.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/hgOjdIr/21415113989.pdfIn PDF document text
    • http://xubabutogazide.22web.org/english_story_for_class_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ditiruvovuluka.epizy.com/tunizidusugetibasufumufi.pdfIn PDF document text
    • http://giwolexuki.rf.gd/wovamela.pdfIn PDF document text
    • http://lilepav.rf.gd/51296003091.pdfIn PDF document text
    • http://tirujukixiw.epizy.com/arboles_de_decision_finanzas.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_94a027a949e74f0292c4acb58a972250.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_de80767f10444f5080eb2661c4269a7a.pdf?index=trueIn PDF document text
    • http://wikijivifefa.rf.gd/abecedario_ingles_espaol.pdfIn PDF document text
    • http://jupokidig.rf.gd/kobisuretarorepebuzadufir.pdfIn PDF document text
    • http://gunodigibuf.epizy.com/2255873477.pdfIn PDF document text
    • http://lopaxoreje.rf.gd/62195806679.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 5664 bytes
SHA-256: 642878bbf44884e82bd06d35a62e1b39340534fc0717b194418c482f8810d03b
font_01_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 11168 bytes
SHA-256: 79ef717ef586e5d00d320d399df427c49cd1bcef770b92d775da9297e3525cdf

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