Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd49f5f3582d7e12…

MALICIOUS

PDF

68.0 KB Created: 2021-06-08 23:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96d6d0d9e536cd7be2ea250bc7646f72 SHA-1: 77ec7401ebcd8c6e78e249a4cb2a609c1dda513d SHA-256: cd49f5f3582d7e12ce6ab141f0706e27062bfb5e4cce31a69bab269927b96518
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The document body, though heavily obfuscated, suggests a lure related to 'mitosis practice answer key'. The primary IOC is a URL hosted on 'nomylo.ru', which is likely used to deliver a secondary payload or redirect to a phishing site. The presence of PDF-specific exploits suggests exploitation for client execution.

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://nomylo.ru/pbw?utm_term=mitosis+practice+answer+key
    • https://cdn-cms.f-static.net/uploads/4443819/normal_601100b28bad4.pdf
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/2858344.pdf
    • https://vudeberas.weebly.com/uploads/1/3/3/9/133997553/5863187.pdf
    • https://cdn-cms.f-static.net/uploads/4405443/normal_6023d45414293.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd6741149d07.pdf
    • https://xuzatikanuji.weebly.com/uploads/1/3/0/7/130775198/49a049bc1a6.pdf
    • https://galatowev.weebly.com/uploads/1/3/4/3/134325578/7440286.pdf
    • https://lawoxotat.weebly.com/uploads/1/3/4/5/134587222/xinenetu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cee67878-d6a7-4a10-a869-9d4f7979c56c/the_watsons_go_to_birmingham_book_chapter_10.pdf
    • https://uploads.strikinglycdn.com/files/ed0feb66-d488-44ca-9568-f59bec3602ca/sony_wega_universal_remote_code.pdf
    • http://ziriwuru.pbworks.com/f/fobamefixunikol.pdf
    • http://pobonagul.pbworks.com/f/laptop_battery_analyzer_software.pdf
    • http://jifesepapo.pbworks.com/w/file/fetch/144448494/11391715929.pdf
    • http://wamotarirup.pbworks.com/f/57340543747.pdf
    • http://jolowajuwijo.pbworks.com/f/jikagomomiduz.pdf
    • http://kevuxezedila.pbworks.com/f/libro_de_quimica_organica_wade_volumen_2.pdf
    • https://uploads.strikinglycdn.com/files/b26526bd-0e0a-44f8-a419-25003930d8c1/how_to_trade_bitcoin_on_luno.pdf
    • https://uploads.strikinglycdn.com/files/7373dd11-8d60-4d91-a805-39a11753419d/81831542497.pdf
    • 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_off0000cf81.bin
56663df063f8d2537e35487147083b2161ff0ade4e4f8c60745278acdd8ae4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 5160 bytes
font_01_sfnt_off0000e144.bin
9d896c73cb02b24f144f4137df9bebc63fd03aff3c9aff065bb1703b77ab2830		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 9880 bytes

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