Malicious PDF — malware analysis report

Static analysis result for SHA-256 3780bcdae155eefe…

MALICIOUS

PDF

77.8 KB Created: 2021-02-08 13:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5044dc6d3e70e45fb091b5d31b793204 SHA-1: a055f67ca12e1e19a07cf4b0a01f1a9c47d118c0 SHA-256: 3780bcdae155eefecd2c39ad6a410845799489cc38508d1ad91bce14615288fe
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of an external URI within a PDF, combined with heuristic detections, suggests an attempt to redirect the user to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/aws?utm_term=addition+table+worksheet+grade+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5ffc2fafa3950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_60017deb40efb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5ff6a3ca01094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482413/normal_5fec99e3c0aff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_6005d67521aea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5fff7a0747002.pdfIn PDF document text
    • http://melukutirigap.22web.org/febrile_convulsions_guidelines_sri_lanka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_601153719b418.pdfIn PDF document text
    • http://rollernefrit.xyz/buscar_imagenes_similares_google_androidineuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/jMLjcig/duxakavadajuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/LiiNhhI/tower_defense_infinite_war_tephas_fork.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
    • http://nitesegu.epizy.com/54159196733.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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 5324 bytes
SHA-256: 216a6620bd574634f9c4ec8badb2fd719def52a1bdd7a7d2c753fc5e3674586d
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 11240 bytes
SHA-256: a0725d34ba1ff1658ed86085b60371f4d2d14c4b0b72cff85d9e1e97cd975457
font_02_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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