Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3683fecf1646f4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 19:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a63c0a63ef2779245fb4c71f35f75352 SHA-1: 2c70249b1fe5c16cc7c1ab6968e276720b23dd4a SHA-256: ac3683fecf1646f42cf6a6c208eea98fd139676f6ca547a033f1cfb4c4e68c81
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 external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to 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://drafthe.ru/uplcv?utm_term=free+running+apk PDF link annotation
    • https://vivaldiroberto.com/img/files/mediafiles/file/96532274220.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/82317131945.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210913110109.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/64181243838.pdfIn PDF document text
    • http://citty.org/images/uploads/file/21435345865.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/39548981371.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8b53e2b01653784f24d451f2836d4242/mibasemopunaberi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/pibebiwig.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/27523087119.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/68433077337.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/53363449239.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/kotageripegelarasubidi.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/pajuginegokadasisaw.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/nomomobigefumeri.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/78057701392.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/ludane.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210905_185641.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/jaroriwakidakobif.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/pulozu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/31a6759439bc009444523c5ca596d893/6432558580.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/gowenapixin.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/mexat.pdfIn PDF document text
    • https://ksboutlet.com/file/files/tizug.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_off0000ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 10164 bytes
SHA-256: 31d9f6224b76681a349bad92344d2b7921c5115e9a963cbed747a84891c36699
font_02_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 17192 bytes
SHA-256: ff0a2dbc6d920a723bfeb523f42574f2b4fd1d8b8a2125369772f8250e72562c

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