Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b7ae0a4d2d4901…

MALICIOUS

PDF

81.9 KB Created: 2021-10-04 13:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1297ae2ad795ca0c981cff518af64e51 SHA-1: f848404893bac34b8f2b18376f8f790907f7cc3f SHA-256: d3b7ae0a4d2d49013ba6e1b231354dc6d38c781cb34267d70122ad2cdfa6c1a7
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 pattern, where the document likely prompts the user to call a fraudulent phone number. The embedded JavaScript is likely used to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://bkairconditioner.cloud4demo.com/uploads/files/69821204807.pdf In PDF document text
    • https://eurosan.pl/user_images/file/fakomeg.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/58688720307.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/89126606051.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/86981922151.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/4756292488.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/pupopulopirevolowa.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/68603195430.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/4994875582.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/74816904041.pdfIn PDF document text
    • http://parentini.it/userfiles/files/kulawabif.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wekumil.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/99536080858.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161582f1f6e075---32784702425.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/bupomibumalewurubuxo.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210908022742185846l27ja.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/30959762276.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/19163239597.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d06b061c37---ruwimolevawibe.pdfIn PDF document text
    • http://allier-genealogie.org/File:/64585773081.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/gimopejudakakobopasawa.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/92116001971.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/gadifuduluza.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zuvigivobu.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/32427970014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=equivalent+fraction+with+numerator+18PDF 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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 11072 bytes
SHA-256: 3cc6348c9e3b7be11cdbb6e22b91cb35bbd007cfa0d1be61ea73fe19da6ac82c
font_02_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 18876 bytes
SHA-256: 93271bf8a3c5e94b48751da5a3a633b44ddbf9d30ee7d0f693e9f790ea9b6bbf

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