Malicious PDF — malware analysis report

Static analysis result for SHA-256 3374b5ba4493299c…

MALICIOUS

PDF

72.2 KB Created: 2021-03-12 00:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 0af3668b8d6d95512d531979a0582848 SHA-1: e21c6541d2c8150a4b92f9962fc4447a9fa6c495 SHA-256: 3374b5ba4493299cfd39562f6b3565fc89b3dbdf23a5c45cbf18ef7818633359
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=how+to+hack+dawn+of+titans+with+game+guardian PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413011/normal_6016237c95712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_600206223bf77.pdfIn PDF document text
    • http://psylath.com/vagekorosafabubiwajivesoypumz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5ffc4d4a298bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_bf9b548283b340509bcaeb9dc04452a1.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_8b964e12497e4ea5a2bc6c5a9d35292f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/51986697744.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/livro_so_bernardo_graciliano_ramos.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/how_to_read_a_vacuum_boost_gauge.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/death_note_l_full_name.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/tarolararerilekoli.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_920ed9ca9bf8486abaab84073afea7ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/61694840207.pdfIn PDF document text
    • http://xiromenabagagi.rf.gd/bominitedemar.pdfIn PDF document text
    • http://riremim.rf.gd/expand_binomial_pascals_triangle.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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 5520 bytes
SHA-256: 4bc7a62640450ba7d806bc410432668e6761816cf4e858f791c8cf48a1c5f031
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 10512 bytes
SHA-256: 7011f118ed3f43b22e6636d49e8e85584fea2bba7d5ffdd83fb576f9dea4e74a

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