Malicious PDF — malware analysis report

Static analysis result for SHA-256 52696e67bf3131e1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 16:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c53dfade50b19794aeb2d620732e8bb SHA-1: 5bf873eb72b896d2cd06b7fec0e6661b89cc0377 SHA-256: 52696e67bf3131e1734f1594516e5e1cbae5d7d71438d7a694c38da7dbce6942
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, and the presence of external URIs like 'https://garglob.ru/uplcv?utm_term=warcraft+3+android' indicates attempts to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=warcraft+3+android PDF link annotation
    • https://kurek-rowery.pl/user_pict/file/29214253654.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/pazitogimekajaxetiser.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/xosulepe.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/palimo.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/mudoruseligejelenuber.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/tovovogogekilejako.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/mozofuliduzanukalumikik.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/41059295180.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/ruwejugugugipekupedupupi.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/58387481236.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/39869587706.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/wawudikogetiwoliwuxivudu.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/84336549967.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/79328408277.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rapoxowepizi.pdfIn PDF document text
    • https://nasikampung.info/contents/files/50728088444.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/52814789158.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/786c34aaaee8e19898b385e43e4795ca/46891306681.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/rutaduzixu.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/58190145076.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe83286733---jinuxuwikititujoroloj.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/lexisunidogaro.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/rukoxojelusexigoxelanej.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/kugitepizawezeriru.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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10288 bytes
SHA-256: 943719a818fbb05f39b2161eef113d92fccbb55a9edfc10338ecc7a72d624f5b
font_02_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 17644 bytes
SHA-256: e222b866b8a3a11d3589132cb7ae066dabd81b59306eb8ca284cf2dbf809dbe8