Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3987c5060c7b589…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 13:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fadb83e14eb77f9db922efa3c9c8524d SHA-1: dec42b69da22faac5b13a6fa7f18978f43630b04 SHA-256: b3987c5060c7b589824bf339eb5928e938d73a8c60f6624ced7a4a75b6d6afe2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains or redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://krisoc.ru/uplcv?utm_term=najbolje+online+igrice+za+android PDF link annotation
    • http://mannadey.in/FCKeditor/file/miwumobuwikamolakisikit.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/gajedaponutagajabanewavi.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/61913091693.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/pudux.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/73687444946.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/12836092403.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/48808820647.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/wafejivizesofikozite.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/21419996359.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/30210296096.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/33379826681.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/86159699645.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/fewatakerasomuwe.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/gexasuletizixerux.pdfIn PDF document text
    • https://greenways.at/userfiles/file/594502497.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/bavunuvogutisizope.pdfIn PDF document text
    • http://rapet.hu/files/1310417469.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/14415781853.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/mobutamimodetovamomixagag.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/46063571357.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5178b9e57---givumejisavugifidasolozul.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fugovosam.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/46663015002.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/bozomomugilivufux.pdfIn PDF document text
    • 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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10588 bytes
SHA-256: 68733ffb9f3f3257ed891dfc21b34fa27105ecb8ee60317dab895c2574e9420f
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 19016 bytes
SHA-256: 4bb6952eabbc8fe9e44166e597a536789e5c7e2a27125d3ea73cc700ed65f162