Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb7153c78596917…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 15:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4c7bf025733db003d46f7b68958ddb8 SHA-1: 1514471f60ea890a39b95d0b9e3cda8992345b98 SHA-256: 9cb7153c78596917aa2106c6e468b7413d1fb6e30081f59167bfec272e50a9e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of numerous unknown URLs suggests the document's primary function is to redirect users to potentially harmful external sites.

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://hoongnau.com/upload/files/3612098723.pdf In PDF document text
    • https://subarini.ro/mm/file/nibajojajabe.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/69105851330.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/98758155294.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/zutedubopefu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/fibugejiwofuzolesaxak.pdfIn PDF document text
    • http://jaqalsports.com/files/file/xujilezukisezevoz.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/mofodinuribukojumupo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9lrop6aah35hrs3lfactiie2l8/kajupifiwe.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/bemupavenalov.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210906093743.pdfIn PDF document text
    • http://oilspecchem.com/files/32330530014.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/25401978829.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8904094386.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/27273514572.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6ee43c4e34e5467ab3a49e0598bd46f1/kirikogitev.pdfIn PDF document text
    • https://trieurodata.ro/images/file/89406516393.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/povinegumuweta.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/xodapadisozepuruv.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/32517855581.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/47559344184.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/tixawilokikulaluguzefo.pdfIn PDF document text
    • https://loyd.rs/images/file/84746708791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=educational+android+appsPDF 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_off0000ad7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC592 10456 bytes
SHA-256: 71cab297b5adeab08527c9a903ff30bb2ea20e1a2080641223c33a193ba2a7d7
font_02_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 17076 bytes
SHA-256: 60c335bcaaadad5d2cfc2fa1ad9350df605d7fd81317a1e04a43e0593a33ecb7