Malicious PDF — malware analysis report

Static analysis result for SHA-256 61677e511d1d1eed…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 01:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d37026fd8de83b569269cc5257ab7e01 SHA-1: bf5a1a5b4bf1ffe59809aacaa258592f171e5bc7 SHA-256: 61677e511d1d1eedaf2158e46840d2b29163dcab1af55e116605a4ccb30c82e1
174 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 external URIs pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users. The presence of 'LOLBin token sequence in document text' further supports the idea that the PDF is designed to trick users into downloading or executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jiuxingchaoshi.com/uploads/file/030137183383.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/apklpnn1em5k0mmsm9t6hh2dk4/wukadulutarife.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/fiwapog.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/26640656944.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/88665415426.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/zikudagegixufota.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/13812100753.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/nodiwa.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/43403652413.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/baxobidijeku.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/90380881837.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jewite.pdfIn PDF document text
    • https://vendax.ro/files/file/tedivopisexugofedumeke.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/72409237279.pdfIn macro / runtime command snippet
    • http://dakdekkersindex.nl/images/uploads/navovasonozejuwa.pdfIn macro / runtime command snippet
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ed3e9b827---35004331026.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/90342652620.pdfIn PDF document text
    • http://classtool.info/upload/files/xadikokefokawareli.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vegibazeboxilag.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/ziduboforimaposomo.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///wazizoporafavodesetuser.pdfIn PDF document text
    • http://saktigroup.in/uploads/21833578390.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/87215755845.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/wajatik.pdfIn PDF document text
    • https://vendax.ro/files/fileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sven+bomwollen+androidPDF 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_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 10508 bytes
SHA-256: e09906d389d6d8e0360d31f7aadcbee4b70a55535db36a06874b96731f5a19bb
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 20836 bytes
SHA-256: 8696719b6489df1efe49726e7fe0f9addb920a76ffbaafeaa5e652bad5e92c98

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