Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9aa14feaedc88c…

MALICIOUS

PDF

99.1 KB Created: 2021-09-22 19:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 73874526782ea3083d99745d8137fe25 SHA-1: 960cac93fafa7ba4e5bf29a0ec1252833f31431e SHA-256: aa9aa14feaedc88cc3138a04f8f4104a657a7cd8039b79fcf89af0d2aef45aec
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of 'utm_term' parameters suggests tracking or phishing campaigns. No scripts were extracted, but the document body contains sequences that resemble command-line arguments, potentially for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=dr+strange+movierulz PDF link annotation
    • https://artasedanasingaraja.com/uploadfck/file/fepafuzukujolufivuxavi.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/setaderuwopubipabigabuvak.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210914130930.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/35154190379.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/40844375055.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/90091186321.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/53491007846.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/72110112170.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/45558495378.pdfIn macro / runtime command snippet
    • http://porpora.group/imagenes/imagenes_contenidos///jiwizejofolusoviregijigu.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/44531519191.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/mamoropixegituposonetinad.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/30818763110.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/70783487585.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/92458458285.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/xotajegasawim.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/pofiwugababota.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/95434599771.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/sigimegereze.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/gafazitajokoja.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/nunuvutigufefudet.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/93265816038.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/jekoko.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/fedesowarefopunepolituk.pdfIn PDF document text
    • http://dfanchem.com/upload/files/fodozepifalokafenaz.pdfIn PDF document text
    • http://chothuexeninhbinIn macro / runtime command snippet
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 10676 bytes
SHA-256: f2b37cd12d1804932449aae62e341622a6751fbd51938181b053d57107a80849
font_02_sfnt_off000149d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D1 20824 bytes
SHA-256: 76a27a315e5ef815116c613426ada16bf374f8f3192fa81b9e58bc1b9b43c8c1

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