Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfbf73e57b5899e…

MALICIOUS

PDF

87.3 KB Created: 2021-10-08 18:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5d90cd260fc0ea543d2b53d79098e17 SHA-1: 0e3c320be558c6b35de9a9a4d834543c9d750f03 SHA-256: acfbf73e57b5899e70aaab88102b19539b81399f362d00fcaad5ca787300b035
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing lure. The PDF structure and embedded content are consistent with attempts to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=the+return+of+martin+guerre+pdf PDF link annotation
    • http://mptech.vn/ckfinder/userfiles/files/6538296900.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/60982233498.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/funekibarodumadet.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/bivege.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/larotaxago.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/99838119080.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210918_040557.pdfIn PDF document text
    • https://olekiwaszkiewicz.pl/userfiles/file/17345207040.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/fikijegepibur.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/76618202773.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/53021879733.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13442282992.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/74405502506.pdfIn PDF document text
    • https://allianztc.ro/files/file/75009231854.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/pebagoso.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/77185611350.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/vipolexomepe.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/54517832553.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/93969832957.pdfIn PDF document text
    • https://buyafranchise.org/files/files/78917244686.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/niwimivaruwepudef.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f609d1514d---46672309589.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/pemekakotizeniza.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090613263338.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/basub.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_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 10792 bytes
SHA-256: 279f21c691eb0820ffc6313418f49fbbbadc47a2e4d64c72f20187c1e5121c84
font_02_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 19484 bytes
SHA-256: ed91bd7822987224f98c4c8b0b54795ddf804eeda2ccd8a80b2c5f631d0a65fd

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