Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6077aa5b0c28ec3…

MALICIOUS

PDF

81.1 KB Created: 2021-03-27 11:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ef9a371437db91f784867694911bb3b3 SHA-1: 0f61ae81fcaefff951120cb66faa8710fe468b69 SHA-256: b6077aa5b0c28ec3527781486e37728304b402ea27023dc0b87529d115e19242
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are disguised as search results for academic topics, likely to create a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it is designed to redirect users to malicious websites, potentially for phishing or malware distribution.

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 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.
  • 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=importance+of+symbolic+interactionism+pdf PDF link annotation
    • https://cdn.sqhk.co/nivazesoj/jcnhehb/facebook_app_manager_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/Ejcgdjh/dabajokixu.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/gfXhcjf/vekuxurenawamaxenawilakin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/27389967438.pdfIn PDF document text
    • http://gevowurarabaj.rf.gd/what_are_physician_service_codes.pdfIn PDF document text
    • http://giwuvupajot.epizy.com/acute_renal_failure_in_pregnancy.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_eb5769ee6c12445a84b7bfa71fc0320c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/vazujejaxevekirav.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/gabaperabudetijodimufexeb.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_3c248712ca61443dbfcb275d28d1f1c3.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_d2fb08dffd1c430f828eb6ee2ab4162c.pdf?index=trueIn PDF document text
    • http://xujamaxopubisa.rf.gd/what_are_the_4_quadrants_of_operant_conditioning.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_e55abf5a556942ad8f56a23d41c4f096.pdf?index=trueIn PDF document text
    • http://pamubaj.epizy.com/walmart_queen_platform_bed_with_storage.pdfIn PDF document text
    • http://sosukaf.epizy.com/easy_english_sentences_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/birthday_greetings_photos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/41563702561.pdfIn PDF document text
    • http://melaworogafema.epizy.com/jever.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_cfca4cd1c9974f23b015953606455b95.pdf?index=trueIn PDF document text
    • http://kusogit.rf.gd/vumabewigafofela.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_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 5480 bytes
SHA-256: b78799268ce682efae8241ed884f07f792ba361385ff5bc88618cdda0af8d2b5
font_01_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 10692 bytes
SHA-256: b2c0fa2e99a98b3bbad3eca335fbb05494ed32cdb10db9576931c5065071462b

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