Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16cee79b0f495e4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 20:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbccdb56114e69e4395daf2e0abf2b46 SHA-1: 967a7862ba9bdc3a6f4e8cae24f75f5a4bf67279 SHA-256: b16cee79b0f495e4485b17f7d0ee551d59f9bbf58c1d6a0a3fcdbdc6e97ece7a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of many unknown reputation URLs suggests these are likely part of a malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://degeninhotel.ru/admin/ckfinder/userfiles/files/13559986426.pdf In PDF document text
    • https://cpsguffanti.com/uploads/file/52715405065.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/warexipanawaxuxetaf.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fb1eafa7---pexitipopazabugogokupoxo.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/nugufupoxinuvuxejivubireb.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kufalenovizevesak.pdfIn PDF document text
    • http://htwy.com/upload/file/zepopuverapuvibuverifi.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/sutoju.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/guvunud.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/81422634351.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/firigedaduzaz.pdfIn PDF document text
    • http://annabarons.com/files/files/3271507403.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/tipevezidozareguk.pdfIn PDF document text
    • http://asfalon.com/__files/file/fifogerinudezovuwowexa.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/10518695146.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/96018088567.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a64b075dd12c45c8965b1d073a2fd013/61619092141.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/8097629183.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/gawuvajererax.pdfIn PDF document text
    • http://nature-revive.org/files/file/sirujefizepepugad.pdfIn PDF document text
    • http://learningkey.org/userfiles/mosomelidotidujafozur.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/reburiworuredadeje.pdfIn PDF document text
    • https://people11people.gr/uploads/File/sijorojopud.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/zasoruxevowuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gps+joystick+ninjaPDF 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_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 17680 bytes
SHA-256: 9783d934d65de53bd93a7217308567b7f45797448def2e2060f73fe99d872eea
font_02_sfnt_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 10464 bytes
SHA-256: 02d7939f2ebbc39a26619a8f7da39c491d248bdc98b7c1c655fb90ec8877f5e1

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