Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a377d287851cd6…

MALICIOUS

PDF

68.5 KB Created: 2021-03-14 12:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f36ca72fa1b215cd1ebc6a6d86ae8d SHA-1: 6f5685fe680f93292ce3df8c3dd7411ae4a6981d SHA-256: 45a377d287851cd6a2912dd4075d4126545d7a90cc34ff9950554e21a3cd062e
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malicious content distribution scheme, as indicated by the ML classifier and ClamAV detection. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The primary URL, 'https://maypoin.ru/award?keyword=automotive+engineering+fundamentals+pdf+download', is likely a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=automotive+engineering+fundamentals+pdf+download
    • https://pedumukelogo.weebly.com/uploads/1/3/0/9/130969284/027df.pdf
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/xanikelo-gisaveze.pdf
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/fiponutinimugage.pdf
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/guxodu.pdf
    • https://legaxebojidonet.weebly.com/uploads/1/3/0/7/130775342/104177.pdf
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/bukebumerudod_malubutog_rojibivod_kapomogeweju.pdf
    • https://jenisevemib.weebly.com/uploads/1/3/1/0/131070602/xapuxebidalumalosef.pdf
    • https://lorotemorotur.weebly.com/uploads/1/3/4/6/134649447/wumaje_tudif.pdf
    • https://nalafefig.weebly.com/uploads/1/3/1/3/131379301/limipudajek.pdf
    • https://witojezig.weebly.com/uploads/1/3/0/7/130776148/fatopewudotab.pdf
    • https://static.s123-cdn-static.com/uploads/4501963/normal_600750aeca8ce.pdf
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/292be02b8d.pdf
    • https://cdn-cms.f-static.net/uploads/4386620/normal_60226f9bd6d28.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_206067cb4be34d5eb8da73c76753edb3.pdf?index=true
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_3139f40cc81d4e6b94381ed8894f60d2.pdf?index=true
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_24503277549c459a8570c00cbb706d4b.pdf?index=true
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_9124d5f593be44b4bb04670f03fa65de.pdf?index=true
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_0f943a9b0f554cbfa01af9d84939c20b.pdf?index=true
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_87ec4601a67b4174b9b66600fd85b84c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee6.bin
27d56990b47f10ee3f74aadec05a257129e4f975d0cdcde44c48284fb6210c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE6 5500 bytes
font_01_sfnt_off0000e1a4.bin
17f8c8399663821eeb68b355b36dd7c0b4b3c12d19c9ba396efcf9d23b36903a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 10156 bytes

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