Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa5765ed2fc5ccf…

MALICIOUS

PDF

116.4 KB Created: 2021-03-31 13:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b60c910372306e8126f9a2297c0adfbc SHA-1: e9635899f135b2f2737349db197ff2b76c3ad5a8 SHA-256: efa5765ed2fc5ccfcaea4d9ea85cb9cab9787dcc38299de2acaa6e58c69f5e64
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=blaser+synergy+735+pdf PDF link annotation
    • http://burrrhey.tech/how_to_study_dentistry_in_philippinesvy2v3.pdfIn PDF document text
    • http://daravto18.ru/tiridofasew5xwsg.pdfIn PDF document text
    • http://losmopaka.site/83019204197cbx3v.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/29f26e41e76b6a.pdfIn PDF document text
    • http://mosasekoz.22web.org/wipezojibowuxelow.pdfIn PDF document text
    • https://zobanegasub.weebly.com/uploads/1/3/1/1/131164549/66272f9973c1c.pdfIn PDF document text
    • http://rineset.xyz/topililebobusurovubetksns.pdfIn PDF document text
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/poxez_xubutuve_zugovutu_gebakaduwejokuj.pdfIn PDF document text
    • http://salleapp.xyz/7576788696g2f46.pdfIn PDF document text
    • http://fasodotujane.iblogger.org/samir_aouchiche.pdfIn PDF document text
    • http://nuwefiles.iblogger.org/wastewater_treatment_plant_design_free_download.pdfIn PDF document text
    • https://jewezuwexokuj.weebly.com/uploads/1/3/4/7/134717424/7481857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokewaperomuveb.epizy.com/jenabibegugopiwajebelag.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/9889678383.pdfIn PDF document text
    • http://peluxatem.epizy.com/store_clerk_job_description.pdfIn PDF document text
    • http://tudutov.rf.gd/american_beauty_script_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/13066013021.pdfIn PDF document text
    • http://vukigopi.rf.gd/14720155453.pdfIn PDF document text
    • http://bimokiteguzosuw.rf.gd/vuzaxarakotuwu.pdfIn PDF document text
    • http://tisilakifejil.rf.gd/endoscopy_normal_report_sample.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 55516 bytes
SHA-256: c3d4fcaa6ef2cd5f956f9899028041d14ea5729f44fb0b1221a4dff8f5d6fb58
font_01_sfnt_off00018797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18797 5728 bytes
SHA-256: 0f2bed90e8944348941cb7315f5ee88e553a9e755cc0a31beb508ee8f3f39f27
font_02_sfnt_off00019b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B41 11228 bytes
SHA-256: a4d9ed5ec94ebc34e9943c712c0fe6933d3bbcf130dfdcde0c0f1c75ef95c84c

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