Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb312a012652c8a7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 18:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98be1bfeb9330bc453060f0240acd4c1 SHA-1: 52454b92f39a6cec9f1d85c2a17cebb6c176e978 SHA-256: bb312a012652c8a7c0e9fbc1eb285b8748fde795e084c3964978961d10aa3097
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The presence of numerous external URIs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a callback phishing or tech-support scam. While no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious sites or engage them in fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=dr+fone+android+sim+unlock+full PDF link annotation
    • https://cargoservice.pl/cargoservice/userfiles/file/13872717861.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/19828900045.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109101324308750.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210903144418.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/lufojinoburopeb.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/sumar.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/95073612936.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/30880660088.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/5809950084.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/94310045425.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/mugofu.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/timeworobizujo.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/wisonugataliwopu.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210908_81F217E167E1585C.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96c5bb393---tazev.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/pegugikuruxozobit.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/jawinisesepixu.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109080400576376.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/97584443700.pdfIn PDF document text
    • http://lg-palette.com/upload/files/61087652402.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1705173d9---93519513475.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/fezari.pdfIn PDF document text
    • http://sswjeans.com/files/51093557128.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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 10732 bytes
SHA-256: 1c81db488671c219a60f7ce661f969773be18bbf183f4dd1430967e924473045
font_02_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 17924 bytes
SHA-256: 27dc4964462d394c427a4209dfd111bf8df17fc506ef9c0575967be62cc7a5b3