Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71d42b8d5504a86…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 21:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cde2fc76d81082eafc247b5b9a35be11 SHA-1: 71bf2d6f758bad97255d2b97fefa665530532b26 SHA-256: e71d42b8d5504a86f5c6553cfed08a90cc1e28e1dd95594fc2e736b67e2294b5
154 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript further supports the likelihood of exploitation or malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=temple+run+oz+hack+mod+apk PDF link annotation
    • http://chonburi33.com/userfiles/file/13357017279.pdfIn PDF document text
    • https://matricula.arendic.cl/files/61402226638.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gajuvinaliv.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/95347071191.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/8081360508.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137195b19119---83223617477.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/64594467747.pdfIn PDF document text
    • http://schokobrunnen.com/idata/54590147508.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909065635689053.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/sorovibufuvimidej.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/lakoxefifedonowaniwo.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/98406419286.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/326163877.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/28650690253.pdfIn PDF document text
    • http://lscapital.it/images/file/gubiledepek.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/48054753769.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/jonufewamelol.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/70721731646.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/novufitepoduko.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/naxuj.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/28988998570.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/62278889248.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/vadajomanadi.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/birofasojepomidam.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a0707949---vizozolozumij.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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 15956 bytes
SHA-256: 7eb8bf198af488390c141f28a4dfb0b126431c46846f0e04fec5860a6b15e9c7
font_01_sfnt_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 10636 bytes
SHA-256: f2079cdfb7baee47cde405ebe8ea1157babeffb95425daf8fc1008ba86e9bfd8