Malicious PDF — malware analysis report

Static analysis result for SHA-256 d779edb9da4e7e5c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 04:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7385259e6a7b207c86294b0e581ffa9 SHA-1: bc11d4461439bee5fec27e4d679cfd1abc60e0ab SHA-256: d779edb9da4e7e5cddfbea778f1e7e73a5dc33414d988f268013d1f765a2ab16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The embedded URLs and the PDF's structure suggest it functions as a link farm designed to redirect users to malicious content, potentially disguised as free software downloads. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mzch.pl/userfiles/file/26744796289.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7f60e81bcbfd8b17eca172f594ce57f7/pikeferukaxejawijapes.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/wegutedukiliv.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/xobozaputuwoselixevinogi.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/zizomuforudivun.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/nawamojukidewesuk.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/towam.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/wirenog.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/rikate.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/sowilulavesogizalamevumo.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68242762694.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/pasotaniwetoxolagokes.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/xagetarodafu.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femutitodaguziwaviw.pdfIn PDF document text
    • http://hopkim.vn/upload/files/dovaputokavi.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109160606529909.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/45910253818.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/womofere.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/lebabajeju.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/kinijokanuwimedikakaxe.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/36991044103.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/bunusolane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+download+minecraft+free+on+your+phonePDF 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_off0000bb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB03 11008 bytes
SHA-256: 4e2c31700334d035c1e6fed40da5821395c3a4a93a2179f7b0cd92af8f2e2ebd
font_01_sfnt_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 16056 bytes
SHA-256: 0764891c28ad916c840fa1a757fded93cb3e5d5419076bad9cf04a6aa044f87b

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