Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2613522dfbbbc70…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 09:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6712b4c4cab44d6cc1a7bcc2edd58e4 SHA-1: d4f0b1521decfb1da833f2425aa3792b2c6d8b62 SHA-256: c2613522dfbbbc700e4fe41e938a1028c077b3e6ff01bddee11f3710fff39d46
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 identified 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 phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e00dc20713---fivujewidetoxofepitunug.pdf In PDF document text
    • https://deltarealestate-eg.com/userfiles/file/57747629517.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/tojebibafonivop.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/32598319840.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109040651362790.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/simego.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/powikag.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fivotusomatavesev.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/lubiwesisigadimarod.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/lerivazegefanipawotutekis.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/genenorobifakakekeridaw.pdfIn PDF document text
    • https://pokereshop.cz/data/file/pifozipafojavazozezasoguv.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/wudomufolonogojotowid.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/18351663126.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/pumudafedosazud.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/57036225794.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92461098568.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/85536620112.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xoxasuvarewiliwox.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/41504447149.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xubimozatukipetedobasadu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/itui7msknmbn7jd7a6d8534910/37832793171.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/xanuvudove.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/17091735229.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/77320516144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=intune+managed+home+screenPDF 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_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 17552 bytes
SHA-256: c9cc8052cabf6bf099b821fe283d20e1972e5905854985ad788f64170de4f413
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 10732 bytes
SHA-256: 2f34b7b85a69569389d87e1e90c258f9477551ffee89da9787c7ada63798b1bc
font_02_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1