Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bd11f4c1bf5f8a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-27 04:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1d9eab288bc1a7265d5c9bec7a3354b SHA-1: 8d9f54cc049aea42472a9b81f2b35efecab5f52b SHA-256: 87bd11f4c1bf5f8a50686548cfc8ae76b12b61767d52364e5f429b1a08fe88b8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=4x4+drag+racing+mod+apk
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1v72u0icl3o5uao43b5f7ve873/25235533043.pdf
    • http://constantemails.com/userfiles/file/1632659640nitojevumafolasotujezojek.pdf
    • http://teplo76.ru/uploads/file/71957673361.pdf
    • http://nemochem.cn/upload/files/49539579442.pdf
    • http://mofrantech.com/userfiles/file/73176132867.pdf
    • http://icmasistemas.com/userfiles/files/bunabatamodivup.pdf
    • http://digitalpolicycouncil.org/imagenes/file/28990656661.pdf
    • http://rwdwebwebdesign.com/img-aim/files/wisuwunusexudux.pdf
    • https://fasaac.org/temp/files/kogilogukomemovowupu.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b480bca7caa07e8186d8807e9c089287/nimuladelazolatamapajo.pdf
    • http://orikon.net/Images_upload/files/zopubexefizak.pdf
    • http://vdi.vn/userfiles/file/34163080176.pdf
    • https://408of53crownstreet.com/assets/media/files/tekawojoderolanine.pdf
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/durefivesobamorur.pdf
    • http://gamax-moto.cz/data/dokumenty/xazirelawozizovet.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6c01be8e---medobafikuguvadifuvotupup.pdf
    • https://juvelyrikoscentras.lt/Files/file/75886521000.pdf
    • http://liqaa-lb.com/files/userfiles/files/dagolulakofizop.pdf
    • https://adikketiga.com/contents/files/28336919240.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/21106432547.pdf
    • http://stringladies.cz/userfiles/60395155456.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/xuzibetemafarakekabazogis.pdf
    • https://publicbridge.pl/userfiles/file/30814695780.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c785.bin
6c42f9595d82df0ef61d3ef34f396cb4343f610ba685e87775c16c29581680a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 10588 bytes
font_01_sfnt_off0000df66.bin
e1d2c600e863dbee28fa344b575b9c58eaefb431f2b083ef870af08727135457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 18808 bytes
font_02_sfnt_off0001109c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 16792 bytes

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