Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dc55faddfbd5bb…

MALICIOUS

PDF

71.2 KB Created: 2021-03-18 01:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8c8f79e75b8b5733005eade5f806fbe3 SHA-1: 9a449885f652e047b67fcbd08d0949834e63f0af SHA-256: b4dc55faddfbd5bbba78fc7be4e6e79dfc5dfb3b58f750064be418b0acce0891
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=ancef+davis+drug+pdf PDF link annotation
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/c2bbe94baef6b.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/3b7ca25c8bc022.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/7efd217e67.pdfIn PDF document text
    • http://loxoduje.22web.org/76231337493.pdfIn PDF document text
    • http://tazizaj.iblogger.org/betelarivu.pdfIn PDF document text
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/5660d41b654da2.pdfIn PDF document text
    • http://xivokosu.iblogger.org/tidajelegekoxoxafiviregi.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://fepezafo.rf.gd/40486864632.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/l2_revolution_spellhowler_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258e6b6c-1e92-4f11-b8f2-d9c0420ac0f7/34200457220.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/archicad_16_student_version.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_ff79da33755341679effd5c28a37a964.pdf?index=trueIn PDF document text
    • http://felixoxajaxev.epizy.com/tetekutalawozotoju.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_0cc6c038378a4057a67c8d18327b57b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9260bbc-36f6-40eb-b81e-68e514834b3d/senufomewokate.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/dedogezawin.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_f9f2a74915b94d438ce66176165bafde.pdf?index=trueIn PDF document text
    • https://55399507-c4df-43aa-88f9-7ea391fc3521.filesusr.com/ugd/a9248e_5b43f17c9b7a4951a1151dfb9d50fbe0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b601a97b-6e05-4c28-942c-3308b0364d5d/applications_of_artificial_neural-networks_for_energy_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/botavusetelakewegu.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/22838466003.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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 5032 bytes
SHA-256: f720e3603d275106ba839aa4afefd2644d97eba6a09e6f48d1e206fd92dce0a5
font_01_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10720 bytes
SHA-256: 5402080e9cb2793e7912ad162e516e63c7885ac539e9612d181ab7364020b206
font_02_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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