Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24585eb60504e33…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 03:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1af3e16fae50c96e10ae0c87cd3d08ca SHA-1: 76e8f0cc0f20557967661cd649f6e7af5ba4a698 SHA-256: f24585eb60504e33a167afa7f5144aa6d274592b37bc2ae4ec645d7c741a1bc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded links, many pointing to disposable or unknown domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://stehovani-ostrava.cz/static_pages_files/file/7156820442.pdf In PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pimipuxukawe.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/42309341048.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/75881190323.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/58915436731.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/marowuzafukadigevajaruta.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/34949721364.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c089083b14---pubefemipugomodip.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/12103918473.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/48790199650.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16130124e7b5ee---zivuwezenesator.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/najuzejolotiga.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/gemuzegoletolulozawidapaw.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xelepaxutifubi.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/vigibimababemakafu.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/6899155377.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/30276254791.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/xetatatasuvunax.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/puzogipobow.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/44455521398.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/72461279846.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/94137646317.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/pamodorek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=uc+browser+moded+apkPDF 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_off0000b3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 10660 bytes
SHA-256: af286a35e7dd173a689350b23673731b88af6cf6e73c346e97a0704bd0fb658e
font_01_sfnt_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16016 bytes
SHA-256: 1c46cd56e30594596e4cd4fff9c30f79fd8ab466e6acfa7a769f1e3b49e0a3db