Malicious PDF — malware analysis report

Static analysis result for SHA-256 780ec2c4d21db4d6…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 14:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7da0b57e873bdee6cb505c35d33a78d9 SHA-1: 368a19e5c82a61cd8c65407b1e7701b8ad010823 SHA-256: 780ec2c4d21db4d6fb4b74c73118e547a70c9c8db5778a80ab287758ded4db7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=quests+persona+4
    • https://foodsafebox.com/ckfinder/userfiles/files/zexiwinuzix.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161366fe25b52d---kafebazej.pdf
    • http://seattlebestteriyaki.com/uploads/files/47383009268.pdf
    • http://evolution-dev.com/file_media/file_image/file/15340565924.pdf
    • http://sage-chem.com/image/files/20210905_095710.pdf
    • http://amandatravel.com/userfiles/file/femararogojalube.pdf
    • https://szekszardportal.hu/userfiles/file/fepogimofo.pdf
    • https://charterboatdeliverance.com/uploads/files/butalefabomukajadixawizu.pdf
    • http://redigonda.it/userfiles/files/90030544859.pdf
    • https://clifestyle.net/uploades/userfiles/file/84705024101.pdf
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/3332359685.pdf
    • http://xingzhongjing.com/userfiles/file/20210902212035_579572368.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/56430601187.pdf
    • https://meganimal.pt/site/upload/file/35266795501.pdf
    • https://incoyun.com/calisma2/files/uploads/62359454600.pdf
    • http://petra-koparki.pl/Upload/file/15481319352.pdf
    • http://residenceraffaellotorino.com/userfiles/files/87689978613.pdf
    • http://splhardware.com/UploadFile/file/2021090806450573499.pdf
    • https://sproname.com/files/userfiles/files/88871444404.pdf
    • http://byecook.com/ckupload/files/nikejaduzuvadetim.pdf
    • http://tentauto23.ru/ckfinder/userfiles/files/78197082358.pdf
    • http://finchamauto.com/pics/49604731374.pdf
    • http://nutronicltd.com/userfiles/file/gowukoturareki.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3558d4c6c229aa8be35d9592aef2814b/88043474206.pdf
    • http://irinabailey.com/upload/files/81491088819.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_off0000b582.bin
81dc39b4a370df4696b6dcbf49f2b341e8cd6c2e2437fcac7c418715af24307e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB582 10344 bytes
font_01_sfnt_off0000cd22.bin
5b5c5b2a1e2616c3ba874cb4c2f29f425b2ec29c3d16a2161f85f92647dff897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 19664 bytes
font_02_sfnt_off0000ff0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 16792 bytes

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