Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1877bb744754c19…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 02:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ad3be5132e32eb9f7b0f389ee4c0d1c SHA-1: 05656d074d5b919844ac5d8b39017bcccca52b7f SHA-256: f1877bb744754c190d8403d28b5768933658e2eb4078845f1859cc885ac9b869
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document likely prompts the user to call a fraudulent number. The embedded JavaScript is likely used to facilitate the execution of malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://dogwarts.ru/sites/default/files/file/nolumudakopuviregorovev.pdf In PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/49984380347.pdfIn PDF document text
    • http://sbairs.com/datas/files/75778680600.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/bufusegoxetofegikerum.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/21342006833.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/tanutebaxadupusovaxape.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/36776274873.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/loxunetulotege.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/5124349972.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/94980899466.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70ce593e1---dineverub.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/84996162469.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109141819156768.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/619523291.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/9747026299.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fogivijudowiworozid.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/52870872622.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/87791326133.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/73723883550.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/mufipasamisimaneso.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/53457697506.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/74821336628.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/vetovaze.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135025447233---mejonulebuwopa.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/61021309828.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/65352972894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=good+nintendo+ds+emulatorPDF 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_off0000beda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDA 16780 bytes
SHA-256: 6b9217c1b57063950cfb1d22fa095661fd9a2a23be6a8483ba151748538ea085
font_01_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 10548 bytes
SHA-256: c17ea23443e95351647fd0094558d515d5fd045732f0aeb55034751275bcba10

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