Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c7cded3d204728…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 21:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77f0cf079d72caf2d041f2146cbeb267 SHA-1: cf4926ee3c1b97c969501cc5cb160be8dfecd928 SHA-256: 58c7cded3d20472879e0144851a5b3f24cd49bde66ade75c8c6ee7ff456a50c3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=android+keyboard+dictionary PDF link annotation
    • http://universalthailand.com/images/uploads/ckfinder/files/43056028387.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb2657d771---kodawadefeje.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/fixakilafusi.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/12847797302.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/limixewavaleg.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/57791174338.pdfIn PDF document text
    • https://comfort8889.com/upload/files/47056604807.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/gokogozurusakupata.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/10781894001.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/57391258216.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/ladupowomuxavata.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/notivemubenegemebama.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/9160719276.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/raxezevono.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/38740432087.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161413eb5a8404---zazakapamojikeguxurow.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444ab946cbe---bevujusedoxufivikasodano.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/xesimomur.pdfIn PDF document text
    • https://ratodua.com/contents/files/31120505069.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/dodexox.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zogudobisawefizefamiz.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/67932804169.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/vasibiwizutewe.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xaruxagetofawexilad.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_off0000b005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB005 16192 bytes
SHA-256: 8adcf349bff1fec6351b1f94e9f8d90affe80a99195391c41c302dd6251f9318
font_01_sfnt_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 10476 bytes
SHA-256: 61a9d5424504208ab4041650727fc588b1e243c287a76ac7abeb2c7e9ad6732f
font_02_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1