Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1f74070ff2ff86…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 22:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbbd34f5b655583598329d64966e7b45 SHA-1: c744ea59afde1c196e554f16eec23a385df6d2b2 SHA-256: 1e1f74070ff2ff865da009d22efabde58fc32b1212f58a1815e998ee50bae251
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rszm88.com/upfolder/e/files/20210903185419.pdf In PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/53107283636.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xusovizizisafapiwaxanur.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/viwivopuwedudesu.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/famatedagal.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/divuvavefawibulinalogafu.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/70656826191.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/14136365896.pdfIn PDF document text
    • http://masonhn.com/d/files/govanoruwofoxide.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/kawulisiguze.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/30288209628.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/20714298514.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/48805491099.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/28631273514.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16148b71ac8cdb---boxufamogo.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/fuxujigib.pdfIn PDF document text
    • http://e-hematologica.com/users/file/86116093109.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc72b6ca3---jiviwagiripel.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/pifofilive.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/48956066817.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/vorurazejutovebi.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/bilagudatemugulom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=maze+runner+game+downloadPDF 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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 10472 bytes
SHA-256: ff9ad23cc8e6f143ea97d1db4362a6de45dd017343c46211e7056348316a0f73
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 17244 bytes
SHA-256: 4dec07cc1ac880b5edb02125144b1d0d074177e8283f4102976f2322caea4b37

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