Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d970a3a0160d01…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 09:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2368ed77f868f89337d6b2ed7c20257a SHA-1: 10d2b3f6ad0fd6a1431573aba8a31d26882f6e3e SHA-256: 61d970a3a0160d01fb4eed5fe2fb60c09fd650c991fc31ebc88e41db5276ea0a
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external links, many pointing to potentially disposable domains, suggesting a phishing or malware distribution attempt. The presence of JavaScript and numerous links indicates an attempt to redirect the user or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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.
  • 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://yoga-privates.com/yoga-privates/file/21629458862.pdf In PDF document text
    • http://dongphat.net/upload/files/zorivigetojibugupozem.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/bupuxoguvixelojoj.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/wutosixu.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/5540817462.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/92090964217.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/5822589657.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/72964626865.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/jobesagubafeludizuzuvimab.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/zutoxesariw.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/92800258196.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dezuv.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/pabutolonudeganune.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xelifoxi.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/fiwedotorapixidobokej.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/merugovivagaxinurugonizo.pdfIn PDF document text
    • http://kdekdyjak.cz/data/fovedekepujokojinumobep.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/64806677614.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/41072789054.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/gobasosegaxifunofuxufam.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/74242912184.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210908/file/16310946178776.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/figamenifoxel.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/tezalasilukulenuresagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+pocket+edition+skin+editorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB965 18120 bytes
SHA-256: d5a325e15903db3978a28b96f51cffbc9db0e5ddbf7c882a0b1b45c5669d837e
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 15016 bytes
SHA-256: e54fb9d121a557e7a0000a7e6bc142663f4ca7a587b68960814a6d81fe9f3e08
font_02_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 10652 bytes
SHA-256: dd49a2571311f78dfceafdcf98fefb89a39c54e02256f13164e19646fad65585
font_03_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1