Malicious PDF — malware analysis report

Static analysis result for SHA-256 83667fd9229d1abb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 21:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2f56e73708be68e946da458be6405b7 SHA-1: 2078e48cfd96b05ff65d7a58cba526c31b6dd03c SHA-256: 83667fd9229d1abb071b62a058b8e230f010f504c30b1ae3d2131ac8da2277ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm. One heuristic specifically identifies a 'PDF_SEO_DISPOSABLE_LINK_FARM' which suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc4257125---jasalikozijuwizimadelazuv.pdf In PDF document text
    • https://airshow-bg.com/file/lututatopinasej.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/60616741460.pdfIn PDF document text
    • http://oris-am.com/editor_up/nuzigulofatamipupamo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161359d8c93b23---gorizanofonodutekulijik.pdfIn PDF document text
    • https://somogyplusz.hu/files/687240425.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/27268626384.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/70335057198.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/47086907936.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/64784817200.pdfIn PDF document text
    • http://birdwatching.sk/media/file/69397727284.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/93861808478.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/xujamalofalet.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/86565416299.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/19968442177.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/17863080107.pdfIn PDF document text
    • https://glozor.com/userfiles/file/buxuvobudusivusidamafodi.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/24591423016.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/63730942539.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905064250.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/xuxonajexinido.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/nisavemefameme.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/68556366375.pdfIn PDF document text
    • http://webursitet.org/Files/file/pedesutunatarufazirom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=organisational+behaviour+pdf+lecture+notesPDF link annotation
    • 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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 18284 bytes
SHA-256: 043525a0374bd11f6f1bf213b7ab087a8fae293102e8b59b1a93e03c7b199ece
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 11228 bytes
SHA-256: 8130318ce02e0781cb8b5009c1473b6254c2ea18d043fa9825c34d3b047b1128
font_02_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1