Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ede5666bf691d1f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 20:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 533d74cc27902f01a50e133742ff4fde SHA-1: 8e741489791505fc3b42dd16ddea11d3c1152f78 SHA-256: 9ede5666bf691d1f5fa2f3a2905ddeebaff30f8a3e583368cf1c62a4bd317155
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 a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://drafthe.ru/uplcv?utm_term=calisthenics+routine+pdf
    • http://ildongwire.com/userfiles/file/90968724300.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/rifalefaboketejomi.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/25103777323.pdf
    • https://cremyco.com/app/webroot/docs/file/60168373829.pdf
    • https://chrmglobal.com/userfiles/file/zupolosizev.pdf
    • http://tinhdauvietnam.vn/upload/files/fagevegi.pdf
    • http://aptekadc.pl/userfiles/userfile/72459891166.pdf
    • http://garantc.ru/userfiles/file/vezojivanalemolor.pdf
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/wobodakovamozibeku.pdf
    • https://martensmgt.com/business_school/uploads/file/21727440480.pdf
    • http://lmleadmanagement.com/userfiles/files/42542658211.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881190bdc2---2398114228.pdf
    • https://zagorjeadventureteam.hr/files/keridisuvutov.pdf
    • http://adabaskimerkezi.com/upload/file/50588686058.pdf
    • http://arcenevents.nl/site/upload/files/78414129085.pdf
    • https://quangtriasianwindow.com/uploads/image/files/fakufedibevufikujimiwa.pdf
    • https://mimpishio1bet.net/contents/files/tusawajedo.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/98216255441.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/foketojirewozeb.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/fofakab.pdf
    • http://goldenstarhotel.vn/images/uploads/files/14685785037.pdf
    • http://bigbulkbags.com/survey/userfiles/files/tivirefezixazavagejixam.pdf
    • http://wwsm-hk.com/files/file/77315315108.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/34715480544.pdf
    • http://anhuicrew.com/upload_fck/file/2021-9-14/20210914033635648253.pdf
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/tupolipezakalixuwigeboxun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e794.bin
6425d829c89a1bf94a0ccefbc31e21228532c28bd600d160c70a20c384d6d019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 19844 bytes
font_01_sfnt_off00011b72.bin
385fba55821b70b2aa5583a00f397a394dc7261c80b05e58119c15d7ddf846df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 10848 bytes
font_02_sfnt_off0001346d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 16792 bytes

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