Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddab7a421a8f679f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 09:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4524ba356cf8bdf34c5c46416e1ced25 SHA-1: f73ef18a51cb7102ac2bb800204a8f27f6fd1db9 SHA-256: ddab7a421a8f679f351d96d74b42532b4aa7e4f0a96ad50100b58f2f88bc705a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to multiple external URLs, one of which is hosted on disposable infrastructure. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://serihosting.com/calisma2/files/uploads/gokidujijepajusut.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/zofidej.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/1685730440.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/dajazukevuzokav.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zerowutajir.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/23877660558.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/83d3114b54adc48fb1a00216521d2d1c/70944938973.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210911015735.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/3658846049.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceed0c6f48---31300398550.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/80258808285.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/28565614057.pdfIn PDF document text
    • https://andhimazhai.com/images/files/nazijanaribumilorapikejov.pdfIn PDF document text
    • https://fototipia.hu/files/files/rexat.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/50158717783.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/juteliwogeniwedexepaw.pdfIn PDF document text
    • https://cian.hr/userfiles/file/lifute.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/nofoma.pdfIn PDF document text
    • http://hybsch.it/upload/file/39205348224.pdfIn PDF document text
    • http://runhouchem.com/upload/files/1751593383.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/kopilix.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/81082408263.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/37010998348.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/nikikufiguvufosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+san+andreas+apk+compressedPDF 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_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 10668 bytes
SHA-256: 20a11d11876faff13f32b126480cf9bf1df73892db5ae5bc1785cca57f24f7da
font_02_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 18584 bytes
SHA-256: bbdddb7e2dc5c1c8aeaa9effe4a0cb23b79200ad4ca11a306040b7fb2496aae0