Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb8bf3a41bc6dfb…

MALICIOUS

PDF

82.3 KB Created: 2021-04-14 19:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fd0fccbe4cd66039437ad7f62e89a0d4 SHA-1: 2600ec8ea9905402af383413f4b9a09ba77c5861 SHA-256: ecb8bf3a41bc6dfbe2ee175621ab61b8fb8bde41f3613bee03d2159af1defbf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable heuristic flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF's structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=music+instrument+word+search+pdf PDF link annotation
    • https://cdn.sqhk.co/wodabumamuv/6zEKIjd/41685697866.pdfIn PDF document text
    • http://gofipupeseg.22web.org/doodle_god_mod_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/dgejeaH/chatham_emergency_services_employee_portal.pdfIn PDF document text
    • http://bigmagazin.xyz/pogivi4bakr.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/23193566921nyij5.pdfIn PDF document text
    • http://iclod.tech/midorokod0pa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_14d6e7ca66fd445891a27a35f65e7e68.pdf?index=trueIn PDF document text
    • http://dikaroko.rf.gd/7839639350.pdfIn PDF document text
    • https://a1caaca2-2281-43ca-b2b5-e8dcf6f2a4ec.filesusr.com/ugd/c6e36d_5af41f10c07e4fd186c367b349eae59f.pdf?index=trueIn PDF document text
    • http://milizirasidemib.epizy.com/how_to_study_for_your_permit_test_in_tennessee.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_bd5b55e8e9eb49a181580f4dcf8bd129.pdf?index=trueIn PDF document text
    • http://lararojezilor.rf.gd/carbs_sonic_supersonic_breakfast_burrito.pdfIn PDF document text
    • http://sabaramofedofi.rf.gd/28897840026.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/10176596858.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_2360475d17144c2e9f1f1735681c83b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/zoped.pdfIn PDF document text
    • http://raliminemig.epizy.com/debepimexukigupaliwure.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/fusodetivopuladutowip.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/fasugisokaponuwexinefeso.pdfIn PDF document text
    • http://zijipowatik.epizy.com/1001_arabian_nights_movie_free.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 5340 bytes
SHA-256: fb24fd7a081903cce40017b4060c184008a0a9e609830faa817c10ac65319159
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 10160 bytes
SHA-256: 664c1a8d708858269335e6e377f8bcb96f3e51acbd30ba8f04ee7cefb92e5b6f
font_02_sfnt_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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