Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7d552da498650d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-28 20:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6a91eb39fe1b61420f6e936ece24ded0 SHA-1: 8a84bb58484c806ffbccd7b1354143d85ed74f23 SHA-256: 0a7d552da498650d09349b1a11c616d36fee4c2cdfaa6515562dc5824e874312
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://crophysi.ru/award?keyword=medibank+pet+insurance+claim+form+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449602/normal_604f1afb8a62d.pdfIn PDF document text
    • http://marketitaly.pro/sidabafadugarurij34gpk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_6029f4b1dbb00.pdfIn PDF document text
    • http://zootime.store/bakasepoluxabbgkh.pdfIn PDF document text
    • http://appletopshop.ru/sex_on_the_beach_recipe_in_cups4blzp.pdfIn PDF document text
    • http://richteam.site/chudi_jo_khanki_new_song_ringtoneab41f.pdfIn PDF document text
    • http://exampl1214.com/would_you_rather_questions_hard_grosshmwcg.pdfIn PDF document text
    • http://nimidarizul.22web.org/bafimilajebax.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/jezaxojipevu/22494883836.pdfIn PDF document text
    • https://721ea522-a1f6-4523-903e-24b3c8014629.filesusr.com/ugd/5a834c_d92ee3b3024f4976b5a7c4847d66451a.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_324653649e974c029c7a2bd44c028e9a.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_1e17188ab79640488086caf823bc495e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/chimera_jailbreak_ios_12._2.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/pubekujojuludopebozud.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/hegel_science_of_logic_cambridge.pdfIn PDF document text
    • http://zisoramemib.rf.gd/28868554259.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_6388b815660648d4b1d563725230c977.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/how_to_fix_pelonis_space_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/filing_a_police_report_online_austin_tx.pdfIn PDF document text
    • http://maruduxelukar.rf.gd/47175239990.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/volkswagen_service_center_long_island.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/91918837890.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_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 5508 bytes
SHA-256: 9c3b1011453d8ca6140bb978c82f4561c148eb1485fcac276dbc4d2a2b05b953
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 10660 bytes
SHA-256: 846a7bae4f91866b6236ed1e402e839b2afdd0e35d4d9bc4345db343cf970768

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