Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f3c5bcdb643475…

MALICIOUS

PDF

78.8 KB Created: 2021-06-06 05:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6847704332be54bb19630413a2fcadaa SHA-1: 903ef2573824278f0a7709c5db34314ab66772ae SHA-256: c0f3c5bcdb6434752541622cf18feee2669194c95be81416920ab50e72c9f88c
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/pbw?utm_term=icse+class+10+biology+book+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402504/normal_605cb17a31a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_6032be8080fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_6063f8685d11e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_5fd870d02c418.pdfIn PDF document text
    • https://jewotefajasofu.weebly.com/uploads/1/3/2/7/132741420/e88153a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_604dcbd17fcad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_601516088e867.pdfIn PDF document text
    • https://jatuzoxoj.weebly.com/uploads/1/3/4/6/134682234/b8e45174ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunaruribeg.pbworks.com/f/best_way_to_learn_sketchup_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70118d57-6bb2-4df6-aa26-4c8cb193d064/rafumaz.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144620427/70051004292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f8ce5b-28f8-4159-99ab-ab4d23e321c7/is_twc_taking_phone_calls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b336a655-4769-4a22-b398-092459b3c5dc/govezomuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1b1bc2-0720-487b-aff3-7392e077723d/6218036192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b8ac33-ba26-4136-b228-7b01770f13bb/76555019035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8f0f79-17af-40df-9395-38d414263258/mugenonofotid.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144465171/how_to_do_book_format_in_word.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 5852 bytes
SHA-256: 3f422206a51f96c2c55b8494b6f3dc41a72e58bae78600fe1a859bc815dcf889
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 11284 bytes
SHA-256: ab4adc4c3af619b865a47292cf00a47dd36f722c484d0e73e2b47bb5b182e095

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