Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e379023eff190e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-28 04:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d992e8f856b2b7e5bdd9b7258ebe5312 SHA-1: 573953f7fe96886b9f9b3244e711176904782575 SHA-256: 13e379023eff190ee3aad3bfe425fadf0590093f0db1471b87b2639260d7a500
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, many on potentially disposable domains, further supporting the lure pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rideabikenews.com/user_img/files/78632097975.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ea04686848f757c2b1bae2053c1d0ac5/negaletogazedapigu.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/kisozo.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/vofodovitepuwepemedi.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/51359069038.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210914162703.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210920_420B01ADFBD1A718.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/81564695871.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/45083778310.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/gopekilofogoveti.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/bikeponujezoxibudega.pdfIn PDF document text
    • http://hak-al.com/resimler/files/lefonofurivefasusi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/14e9edffd11a13a7f91229808aa61279/jefipozuti.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/tewosofunejefikujemuwit.pdfIn PDF document text
    • https://hinaweb.com/upload/file/najozasosuvijeritajolagu.pdfIn PDF document text
    • http://arucax.am/user_images/file/xetinavikulipunulevujenuf.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/jesisojaxuferadupivugusir.pdfIn PDF document text
    • https://mkart.it/uploads/file/giwiw.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/finefawexik.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/metanosum.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/54753522186.pdfIn PDF document text
    • http://montereypark.kopanramen.com/uploads/files/ziworotifofegapigutojor.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/50919169976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cara+mengatasi+game+lag+di+androidPDF 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_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16988 bytes
SHA-256: 8af66c91b1a5de53a400950d01245df05d82d98621f568d5e881fa6bca81af83
font_01_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 10620 bytes
SHA-256: 32a8b910dbb6099c0c79c25d2481d56b86c34d01a969ee98486f8abe9a317546

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