Malicious PDF — malware analysis report

Static analysis result for SHA-256 044ffc5d00fa5031…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 19:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9e5684fab9d3608ce4b2b64ac8c4b10 SHA-1: aeca4ca9724ef2b8988795de50a10c1d9864f011 SHA-256: 044ffc5d00fa5031a54884b576c34b78a56bb85e9f9a58b8a2ba843fb1b00154
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for redirection or further payload delivery, hence T1059.007 is included. The overall structure and high ML score confirm a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=guardians+of+the+galaxy+putlocker
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/sinurekezarikosotojexuraw.pdf
    • http://bwlpsalisbury.com/uploads/files/96825632216.pdf
    • https://heritran.vn/uploads/news_file/33596646276.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/20445965333.pdf
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/38782222787.pdf
    • http://sangtaoad.com/uploads/userfiles/file/89479192147.pdf
    • http://heorungminhphat.com/luutru/files/valeka.pdf
    • http://e68momo.com/shopadmin/upload/files/78983873949.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210910011649.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48753773923.pdf
    • http://ggmtc.net/userfiles/files/87798491207.pdf
    • https://cahayaapi1.com/contents/files/kilevajigin.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/884f397eca147ddc07af7567fa1b3798/66584040945.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dilaner.pdf
    • http://intertribo.sk/files/50578421460.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/32432002886.pdf
    • http://smartdeal.pl/files/upload/files/zakuvisetaxi.pdf
    • http://kaus21.com/userData/board/file/49913550568.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/bowagudajemuke.pdf
    • http://flynewsletter.com/uploads/file/31104717407.pdf
    • http://canvangdientu.com/images/file/bonolaligesakatukuvidedu.pdf
    • http://advocaatindex.nl/images/uploads/wanepazugixokivafuw.pdf
    • https://vibingvibes.com/userfiles/files/39625702565.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_off0000e7fd.bin
e2fe4b6b28cbd2f9c034ca9052120dfbbad1fc500ed2ba75e61829d01bceed9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 18452 bytes
font_01_sfnt_off000117e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 16792 bytes
font_02_sfnt_off00012ff7.bin
f6c528d9ee032054000e2d0cc7528ab774be3a3e033657f05cc793b34928a9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 11348 bytes

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