Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa24fdf965286206…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 14:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42b4a0bb352c0f5a557e02370a6b635a SHA-1: 74bc2eb6d24adcc08fbb19b478abf4c2f84fe0d7 SHA-256: aa24fdf96528620645176f41ff46fd8c7dff9fc6f9e1f5b6eb9c9690ad628aea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and the presence of external URIs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://dr-temt.ru/images/file/zitatep.pdf In PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/40302866842.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/parob.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/gigebifufipab.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/9303638012.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/27448430541.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/rarutiluzutunifo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b8838a762d5f92544f5dec0412fe8e13/rusuwu.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/jajolisufuwosogo.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/83820934316.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/lariloxigapul.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/folibomagumabuv.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/27062438945.pdfIn PDF document text
    • http://szwygs.com/upload/rerivevalebolotuloxanapit.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/zapipudikutokurom.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/vawufipekumabuzuwukegu.pdfIn PDF document text
    • http://e-menu.hu/editor_up/66053957417.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/96165232359.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/251a62ef873b355d14d6b9832d8268a1/zufojuwusowi.pdfIn PDF document text
    • http://canadianrockies.info/files/file/lowerosawodapukerexiwumes.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/96205094227.pdfIn PDF document text
    • http://dges.in/userfiles/file/58244990150.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/luvibolazubari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cod+boz+2+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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 10088 bytes
SHA-256: fd64212a5469f6e8adf91b2e9e3662a1f6a492b8429ef7b579da30a7fb19f819
font_01_sfnt_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 20012 bytes
SHA-256: 64b0ae9096b0fe03608c08f01b3a830c7e0d7bd5b10c2cf281685ba81910e152
font_02_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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