Malicious PDF — malware analysis report

Static analysis result for SHA-256 291458d1f07f622f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 15:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f465339bfd3a25444fdaca66b033fda1 SHA-1: ce1c2370dbd5668a572e71014e90d80469a8cad4 SHA-256: 291458d1f07f622f8b14157a8c7076e0dd3c09220e62b7d19593478103b1d8a3
152 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8174

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://anaksemut.com/contents/files/89309046476.pdf In PDF document text
    • http://akgwealthplanner.com/crm/files/10009905227.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/70837773940.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/dezew.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/12697985602.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/wexizegaxakokebuwe.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/11021966205.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/3887071940.pdfIn PDF document text
    • https://durimawar.com/contents/files/67611023711.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/jalivizilo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d93825e7a96336816ef0de24f1dd573b/18252160554.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/jujaluralepisetoxopajob.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///lesawagasuziruv.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/94163403500.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dafusinokuwojaxe.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/zefipowolagasovopugitijux.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/nopiba.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210915_145545.pdfPDF link annotation
    • http://maurovalleferroarchitetto.eu/userfiles/files/28807872081.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/fazuxasikovugamojusifabug.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/zitefegeb.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/risod.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/61478311398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tefl+jobs+malaysiaPDF link annotation
    • 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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10420 bytes
SHA-256: 2c68e901120ce9f1b52fc43f6d5989016a92817a014f26e73bf1ed5458cb6f14
font_02_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 17840 bytes
SHA-256: 21840412943cf82db272557cb4169c067429b6331b5aee9b0dc2cb1933df8208

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