Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f923455295bf8e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 04:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dd048239938ed68536bd07e2865c8df8 SHA-1: 4a744dacb3a62c9aed4d52df05a851aacfb771ac SHA-256: 21f923455295bf8e954bb029d61c6bf0cb3360052fc352dfdbcbb2b46eed3300
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many of which are on disposable or link-farm hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=3d+sex+villa+2+android PDF link annotation
    • https://xn--80aesyq.xn--p1ai/files/file/3356701046.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/36236968540.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210906_2AF3FF4D93B68832.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/gebutabodixobuduvupas.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///mumidilo.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/30490822329.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210901053129.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/16040059179.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zedobafafodukexis.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906162033_2062480591.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/89320980712.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/93297848681.pdfIn PDF document text
    • http://01host.ru/userfiles/files/41912138069.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/kezijugepanaxawukebusipo.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/89295024377.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/13666212091.pdfIn PDF document text
    • http://yilip.net/userData/board/file/10233953966.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/21599666474.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/fitewixezetetojopofope.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/lemunom.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bukumelevetewun.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/96168035744.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/jufegawumiragabajebimapun.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/dajinamu.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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16256 bytes
SHA-256: e1d57062f9c53c5221aa5d442c666160c82a657860993433c414d6b0d98c435e
font_02_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10504 bytes
SHA-256: 6df9e1d6f10f9db92882562fd6f71e3b967a673cf4c239ffcf561b8946d620a2

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