Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbb9053cde1dd18…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 19:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ef174b28590cb56945ac4ff76280fa29 SHA-1: ecd9dd271a74387ad11798523f47670006300cd8 SHA-256: 3fbb9053cde1dd18092715215e3a29d4ee55015c48dd70b4ae37ac675fbe7007
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a large number of external links, characteristic of a link farm or phishing campaign. The embedded URLs, such as 'https://nipisod.ru/123?utm_term=algebra+2+solving+systems+by+graphing+worksheet', suggest a lure to external content, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=algebra+2+solving+systems+by+graphing+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369511/normal_600be4dfe56f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fd90b6ddfb0c.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/410003.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/htihEEC/badekupigakoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_601abe8b35449.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/vibimijanumagefa.pdfIn PDF document text
    • https://gimifuzakid.weebly.com/uploads/1/3/4/3/134315082/gidegogar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468554/normal_5ffdc836128cd.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/jaheghk/darkness_rises_pc_version.pdfIn PDF document text
    • https://vimebadexij.weebly.com/uploads/1/3/5/2/135295776/zimure.pdfIn PDF document text
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/8520995.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/Lxivgfa/atomos_ninja_v_5_4k_hdmi_recording_monitor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5feb88c9876c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/kuziguwaniwozinovew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a9a565-0367-4952-8adf-78e0f872575d/heart_drawing_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/school_uniform_pants_old_navy.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/30954848877.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/rudodudobaxujopiduf.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/fakanesogetanuwogokozeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91292a24-0573-4fc6-acad-5314343132a9/directions_for_the_closest_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865b871f-e1c0-4472-9319-7e23c30b0a20/is_girlboss_going_to_have_a_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/is_a_drink_package_on_royal_caribbean_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a29853e-e5ab-4dd3-81f2-7e3ccf4ca281/physics_lab_ideas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 5812 bytes
SHA-256: d590f627af60b69636bd6ff43ad543efc1a37f0a0dc00cbf1a8c5807c7dc8ff9
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 9932 bytes
SHA-256: 9dfd0129a4c68a60e79f3ff1f8589fedef1e5b3b41e8303746b84e4d2fee52d6

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