Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa89013b92d2df2a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 22:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a38084496e6b860287bac0824082214 SHA-1: 57066341b15bd5171787cabb8d4c610bd99e1fa2 SHA-256: aa89013b92d2df2a803ccf09e379ddfe122430d27453426755ad5bc8c5ddb3b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish users. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://polandpools.com/contents/files/85578919249.pdf In PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/pinupod.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/wowazozozov.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/39249635091.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/6790220176.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7bf70c09---motilusiw.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/36894425252.pdfIn PDF document text
    • http://irinabailey.com/upload/files/9853232957.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/nejidaforobiluvuxaw.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/83653567681.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/87869637150.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/4175148607.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/10468910411.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/setekaleduvuza.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/rotamuvusuzaj.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/wixaj.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e75d45ffd5efcfc02181c5a830292530/woxedepixalarinugu.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/97943752135.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/jopuxepoviragakuxaxu.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/diwiputusum.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dadozaxibolagowe.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/mubexozepudejizuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=secret+codes+apkPDF link annotation
    • 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_off0000c1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 18036 bytes
SHA-256: 9bd3f659b2721a45266f6eced48af744a5c3f7a56976ef47d7273ed6ddc409d1
font_02_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 10432 bytes
SHA-256: 4bb0771e5f1c17c0143d446521a6240e19e73afadbe42aef36e34df3e7ad9199