Malicious PDF — malware analysis report

Static analysis result for SHA-256 7536ec27878166ed…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 21:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12e177c2ddf0cb531463c62b30e31f06 SHA-1: a8b6fe3c045da0be6f942104c16b907a9592e917 SHA-256: 7536ec27878166ed5d7b0bbbd70e9d9175ef84863a4e3789c5c16bbdb6ddfa2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=31+days+of+praying+for+your+future+husband+pdf PDF link annotation
    • http://healthywithhart.com/res/file/47553102873.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/42663678398.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/83618025545.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1def477c7---timijakixisozuvisa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf63db4f4a---nikopezakepizona.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/kafisujexuxoziwawa.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/pixijajowubajunobuvijusit.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/19391710203.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/tufitusumofogagogubulu.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jebiz.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xulawozufuzonawitenem.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/97995839513.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/lesapotofozixuwipopujinap.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/15478783828.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/72771042079.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210915_57EB066CA29ABDD9.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/72534126770.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/83946138389.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/pebududeb.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/96414263013.pdfIn PDF document text
    • https://titishop.co/upload/files/50338768531.pdfIn PDF document text
    • http://clickvay.com/upload/files/xavewasi.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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 17880 bytes
SHA-256: 118d75075f375083414bd2bf04a18c8976e94669c68d0e81bfae5c4157e599af
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 11212 bytes
SHA-256: d867af97ac6d2e0506f12197909abd511215748b8fef91cd8b2f019a6a8dfec7

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