Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d749c560e83d66f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 17:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4352636669b7a316815ab0ab41e58167 SHA-1: 7d67c2b264795b2c085be56e50a9ffbd1e4ea76b SHA-256: 2d749c560e83d66f92238293971fff4415cda06b9222ac287e05b8a87540493e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of embedded JavaScript and a large number of external URLs, many using UTM parameters, strongly suggests a phishing or malware distribution attempt. The numerous links point to disposable hosting, indicating a likely attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=airport+extreme+android+app PDF link annotation
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43117020442.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/xiziposipeku.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2kpmjf51j8c2fb5pmjh3agkpi9/46587158818.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132107173259---9782981012.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pabofawixonemasuw.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/43951167933.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/64423247947.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/46953168326.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bisulejinazil.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/jelopedira.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/xisafesaziloz.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/98081288472.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/vobenolux.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/33120097084.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/23538984312.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/69951959493.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/81801232758.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/42602715893.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/36624468051.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/40660761281.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/dejelobofekutipofe.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_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 18944 bytes
SHA-256: 213cef7569aaa29449c57d4de37779ff14ca4bd71389c59be21e067397031e42
font_01_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 10424 bytes
SHA-256: 88f0d5c85824a341f6ed39254f2e5901a0b38490109edaa689c9370a80962b53
font_02_sfnt_off0001366c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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