Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a932500b6c889a3…

MALICIOUS

PDF

82.5 KB Created: 2021-10-12 01:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7aa93a14c832cd8d728834a937032771 SHA-1: c22ef899389b6a52d6e158771dbca01dfc484669 SHA-256: 2a932500b6c889a3ac89d1c61fb96ece618e3e74cf9239fbc9599636996173c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which are likely part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to disguise malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://saikekanglun.com/filespath/files/20210912122722.pdf In PDF document text
    • http://kenhuffbuilders.com/userfiles/file/21494669867.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/pokakikopenaletakamusab.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/mekivisoken.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b85cad902---xutiwewijijisa.pdfIn PDF document text
    • https://sim2007.com/files/sodotanivo.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/musupuligekijefaga.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/60276881263.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/zeraguro.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/51046247591.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/loferejupoxele.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/12695223973.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tijotamalegaragonorum.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/luvelemulosisawel.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/kojinedaxisate.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sidinajoxul.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/fosadubukufiginazipekexo.pdfIn PDF document text
    • http://termocity.by/pics/files/funedoxiwetuni.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210930164348.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ae086eed1---tafafiwavinirojid.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/kemotiv.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/pirukunexopapiropeti.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/82570108586.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/ponawin.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210903163140.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=strength+of+materials+by+rk+bansal+pdf+free+downloadPDF 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_off0000d62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 11452 bytes
SHA-256: 71c1df9f3cfe3cceb7d21ec68bd9fb354670c1f529cc18b81de18adf11266989
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 19016 bytes
SHA-256: 55942a738b46a7860a82b1279cd1be279b9e998568fb1e79249152ca53de9247