Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5d268f133a2d30…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 22:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64e7bb1be39160d3bc890071aa308ab5 SHA-1: fb36dcd509614b48fcb368fc77d449f01ab700b9 SHA-256: 7a5d268f133a2d3025b0d0484fa25672a8389f5895d9289020544a72255e9a54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm, suggesting a phishing or spamming operation. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hanedantoptan.com/upload/files/setakuzesa.pdf
    • http://olympusflights.com/files/files/68494598844.pdf
    • http://abc-tel.ru/data/File/kebamomanepotujidi.pdf
    • https://betenagro.com/sites/default/files/file/fubatanapevemubalupufujab.pdf
    • http://erdbau-rauch.at/kopatof.pdf
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/14105425219.pdf
    • http://stjconsulting.it/userfiles/files/44058689881.pdf
    • http://dakdekkersindex.nl/images/uploads/bagapubazakejibidoj.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/24380086926.pdf
    • http://tahyuh.com/uploads/files/202109042016336437.pdf
    • https://solener.info/ckfinder/userfiles/files/26476481075.pdf
    • http://braciszewska-klimek.pl/fck_files/file/30115760956.pdf
    • http://perksys.com/userfiles/file/fuduzovadukipalunozine.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/11737235572.pdf
    • http://metalzilembo.it/userfiles/files/takepejozuxe.pdf
    • http://watch62.ru/files/files/melokovalirajerugavigel.pdf
    • https://houstoncoinshow.org/FCKeditor/file/jamawigulelefuxikotexis.pdf
    • https://cowichanmusicfestival.com/userfiles/file/tanofaduwama.pdf
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/34936685027.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/20709794949.pdf
    • http://aktifbant.com/resimler/files/21760389150.pdf
    • http://cestovni-postylka.eu/userfiles/file/46611733401.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/74160277800.pdf
    • http://ahdjcm.com/upload/files/19393238412.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=generation+v+bucks
    • 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_off0000ec6c.bin
b28ecce26c6e8275d26345ad4eccbde36d4d44ea99f7182a3fa8cbaeff41b0fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 18236 bytes
font_01_sfnt_off00011bc9.bin
25e0c4dcfa82dfe94b2c8e2798a6f0b5ec5436fa280015672c5a7fca92475163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 10616 bytes
font_02_sfnt_off00013446.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 16792 bytes

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