Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0182ca947ab825…

MALICIOUS

PDF

86.8 KB Created: 2021-10-11 04:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 2b1b099413cb2f7ad080dbb0f72fa074 SHA-1: 1ee694823165f50493cf9f3c2bdc9465a85cbd37 SHA-256: 9f0182ca947ab825f320b7fca1567eea5e1188f91dfdfeacbf1c54055a23fedf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for distributing malicious content or conducting phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 4

  • 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://zhongzing.com/uploads/files/202109122106553823.pdf In PDF document text
    • https://oddluzanie.net/userfiles/file/74605707451.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/jejisodadisagew.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/tovozubodi.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/mosoravumodopa.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/97363368904.pdfIn PDF document text
    • http://househouse.it/userfiles/files/55753918901.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/fikosomogujepanepefofo.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/67343892032.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xojogofaberejor.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/53121902334.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/vufasijuxogosesasaw.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16162ba0759d09---72444534268.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/zigelopuwodumaro.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/meduv.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/5906430885.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614af1b88f6de---kavarugelavemepekibavozij.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/91475796291.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/44965591041.pdfIn PDF document text
    • http://apvn.info/userfiles/file/84240391547.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/varos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+free+80+robuxPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/91499691507.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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 20148 bytes
SHA-256: d2565a41797acd31d742148bb8e6b0ddd1d805ecdb0d6905d02732ae157918f6
font_01_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 10564 bytes
SHA-256: 9285ff63a7249184863b50178cf2bd103bad2f6c79683ded20958f98229d0c06
font_02_sfnt_off00013597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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