Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1d7c602b80fb81…

MALICIOUS

PDF

102.7 KB Created: 2021-09-16 12:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 178f3f8a7ad8af15795e08c8b60f4dd2 SHA-1: 43cb12447ff56df5aa2bbc785cf269435afe92b0 SHA-256: db1d7c602b80fb81a0617edebce5577f8baa4506932d10af2900ea2f67728983
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://smidgel.ru/uplcv?utm_term=how+to+set+alarm+on+samsung+galaxy+s6 PDF link annotation
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/67997669400.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/55504102160.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/60062016327.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/xuzitisegodegiwog.pdfIn PDF document text
    • https://salwangurugram.com/files/fidirak.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210914_A2274198F7F7AAE6.pdfIn PDF document text
    • http://soupworld.de/upload/file/8240137613.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16142f45e9f985---35059153133.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/70043610651.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/dusijesemaxibupov.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///40413302635.pdfIn PDF document text
    • https://gilbertems.com/videos/file/94515867088.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/pugokurapavatatonewu.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210903140000_8yszud.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/nuvijinitenenib.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613450da58a5b---rigisepe.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/gafifakimiximades.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/79343034814.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/56270835001.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/48395725314.pdfIn PDF document text
    • https://mar3ol.com/Files/files/23121205474.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/foxujeva.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/41537673105.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/78381161097.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/wagaxugerigirese.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_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 10920 bytes
SHA-256: 2004aff62da1963c21efcb20c6f0691625783304121189e5c1e5e8217945f814
font_01_sfnt_off000142b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B4 19248 bytes
SHA-256: a14026bc20c4afb982a5ab5e82792e350efb070470098b51395bceee2df80e8f
font_02_sfnt_off00017462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1