Malicious PDF — malware analysis report

Static analysis result for SHA-256 587102257342b42c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 19:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58bdd46ebcde35aa771f1aaaf45bcd10 SHA-1: c16060933decc15d7e1979929505e24154e6cdc9 SHA-256: 587102257342b42c88df83ae5fde0b3941635b3c94cf739c86647e06cc5a426c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into visiting compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=download+raft+di+android PDF link annotation
    • http://montesantangelo.it/files/files/jezazepatusorutawumupato.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/fifulona.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/zijamevibomupetaxemiz.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/9125939618.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/36327386839.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///wiluponadelapig.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/75457557549.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/93337752260.pdfIn PDF document text
    • http://orderkai.com/uploads/files/tuvuma.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630732100.pdfIn PDF document text
    • https://ptogel2.com/contents/files/zabobagotugemunazelatobef.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/31900270893.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/mefisesuxafisesajiwuj.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/64822620595.pdfIn PDF document text
    • http://greenld.com/userfiles/97763648073.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jthfv59qe2g0i0qavhcbo1n5ap/kojomejepegamigadotusaku.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/8530726520.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/44582014625.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/janusupu.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/rininiwisipubozenezozu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/70158399452.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210906101345.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/73603900466.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_off0000c39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39F 17540 bytes
SHA-256: 717551db2b34082f30f3006f18f7643c9f219f3ab265f2ae5b504d62c81bfd08
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 10132 bytes
SHA-256: ad2fe71d7b3748c37c60b34da17a869ad821ecf30e6ae2d012e474e0772d5ab4
font_02_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1