Malicious PDF — malware analysis report

Static analysis result for SHA-256 565a189bb6ce36da…

MALICIOUS

PDF

77.4 KB Created: 2021-05-07 19:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bd915ec155ff18962c6115441cf3926f SHA-1: 212b4e851ec52f54e66c54306d147c55aaaf2b42 SHA-256: 565a189bb6ce36da7451836c563c84f03f60e03795ca91c4ede2458666f5e087
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=how+to+write+a+report+assessment+centre PDF link annotation
    • https://cdn.sqhk.co/ribuwikoli/hfchjha/series_circuit_analysis_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/csiXaoh/23856312619.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/iWVfhdq/coin_farm_terraria_1._4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_9800c330b495430789eecb6a7f1f4862.pdf?index=trueIn PDF document text
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_b5054b092ff1493c8896795bad022a52.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_ccca666eab8348bbba753ca8b8b6689a.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_723d45a2e68a44f9b6301c102f6611c3.pdf?index=trueIn PDF document text
    • http://pifetageror.epizy.com/rezexi.pdfIn PDF document text
    • http://neroxijojin.rf.gd/37327934568.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_16b43f2197e64a60892b930b7640d156.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_5268124b582d4828b48c27d2aaa5878e.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_4f1f6a47760c4cbe80b53b212f3382ac.pdf?index=trueIn PDF document text
    • http://katibabiziv.epizy.com/gatineau_park_ski_trails.pdfIn PDF document text
    • http://bujegijuv.rf.gd/saduli.pdfIn PDF document text
    • http://rowagaparik.rf.gd/add_subtract_multiply_polynomials_worksheet.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_0393cc827320434296ad6792b5eb905c.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_71ca64569a844720b3c1434dd8b4498c.pdf?index=trueIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_8f62fb5c660d43e1a6b38e7a17771b22.pdf?index=trueIn PDF document text
    • http://gobavaduxa.epizy.com/master_of_orion_3_cheat_mod.pdfIn PDF document text
    • http://peluvunuw.rf.gd/8717544098.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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 5100 bytes
SHA-256: 5225b31991ddef42ed4926ec4179b4aa812bb4ab33e9144a0a69a2965b2aa250
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 10256 bytes
SHA-256: df73681331a6a6e03d2c6e8b759757bddddeae9353838a28f274d39031eb2a42