Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2512ff16ad6142…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 08:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b79497f532887665a927c7da9bff9e2 SHA-1: 6f7d5a4e0653767c9195b45e23cbef3abc81ab84 SHA-256: 6b2512ff16ad61420bad0f1462accd8e9993adfd3041a79d95ad71d70cee5fa1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The presence of 'utm_term' parameters suggests an attempt to track user interactions with these malicious links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=screenshot+assistant+apk+download PDF link annotation
    • http://german-ex.com/images/blog/file/77375480143.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sekaxola.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/55334037387.pdfIn PDF document text
    • https://iword.de/userfiles/file/23356031535.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/40498739085.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/93258171588.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/85235072577.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/delagulibutop.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/varebitaduvizapija.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161362585bc40f---xukoxizis.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/xozenivoparewader.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/bunafevekufiwufi.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/mipazokazaladokifaxap.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/zamevima.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7331a09d---38667155198.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/nowotesuwifomelotizi.pdfIn PDF document text
    • https://rippa.pt/files/file/ritesenunan.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/fazazijuludojelek.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/79082320909.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/89776392298.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/43942355376.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/xaxuzur.pdfIn PDF document text
    • 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_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 10864 bytes
SHA-256: d57473dbba1dffb748092a897e2142238139ee4d58c7ee4e7eed056f53400cf5
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 20024 bytes
SHA-256: 95eef501e8d0184732f24a177b5ccb3ef68e6e4d68373b45afe4358e61d7d41b

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