Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dc54d02d1041fc…

MALICIOUS

PDF

89.1 KB Created: 2021-09-11 08:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: b8df62ba7c7af77882576b282e63fc07 SHA-1: eab7448e4042bcf563b6bc9512037518ae18c4f3 SHA-256: f1dc54d02d1041fcd4b7d7312776b91a564af0054e60500c5709dca0178aa935
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=nama+app+untuk+edit+video PDF link annotation
    • http://satisfytech.com/ck/upload/files/wepibumopaxetipe.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/zujixanaw.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/voretajozamazadizukoriz.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/dulabosilaxurefuv.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/zasoxunupatilemajab.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb5f7a187---fozobifasabu.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/98294381724.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210910210027.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/4487126861346c4da5faa.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/30060197707.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/rirumujaligozat.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/90319604166.pdfIn PDF document text
    • https://jagominum.com/contents/files/texusukorijopesuzesux.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/39286215350.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/76457251711.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/pakuvakagepunenegu.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/taxasopovefofodeziwolozaw.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/828279411.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/navibozotawisoromozug.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/mikavefowurana.pdfIn PDF document text
    • http://harlit.com/upfiles/file/68136097500In 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_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 17236 bytes
SHA-256: b5ed90ca7fbb1fd68629942da98edae1663db0d889fc62dba6ccb00b32774102
font_01_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F93 10472 bytes
SHA-256: 93e5954bd6ba6e325dac522c3bccc48410838756b39bc86aadf2198d693c734e