Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc1e87c5997d81a…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 09:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 287d5a61ae9a9cf5405066c1f035a4bc SHA-1: 56d23c5e3ee5c538ecc94f06ba1d19dcc18a8262 SHA-256: bcc1e87c5997d81ad6dbf84f65a9cf91d8908a99a1d24fb47b15d0f8b652d80d
186 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. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/123?utm_term=secret+love+song+sheet+music+violin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419629/normal_604ef0619dd86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_6031501954537.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/YfVe4ij/dolufoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5fd8a1a5cb4bd.pdfIn PDF document text
    • http://newowoliso.iblogger.org/tipogixojis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_602edec347cc7.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/ibGjifg/dikoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_603c422064e40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe17a19-09e2-4017-8641-43f4a7027515/determine_the_force_in_each_member_of_the_loaded_truss_chegg.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_3e71a0f6dede4749b5b5aa353d0f62b9.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_5eccd5ed7f8d410aa90c6fa6bf250ccd.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_cc2909b574d746f0aa0e0960a20c0575.pdf?index=trueIn PDF document text
    • http://wixobemiberug.epizy.com/bellary_weather_report_map.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_af2bf73c4823437695139502582fae92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gitipelut/command_and_conquer_generals_mod_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092797b8-cd0b-4888-8ccf-a1a12c0e9797/wefijigejefi.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/44506153874.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_22fffa4430e74729968e75bd181f5946.pdf?index=trueIn 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_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 5168 bytes
SHA-256: 50ee7157e804cdea7905af086f986164b9795d50e258971218d9956fb2e7ff63
font_01_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 11068 bytes
SHA-256: c9e89f99f24da07aea1421157871c5b89c36083867bd4a5f6f535ab8744034b9

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