Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2dd3f3110e3546…

MALICIOUS

PDF

84.2 KB Created: 2021-05-01 01:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5f595e2407d322c0e2c25799d6b04a2 SHA-1: 8b8bc66d0ff2dacea647a0737adaa7ce78b2b4e2 SHA-256: 2b2dd3f3110e35469c53508d31538357dbe611736e64de67c64cab70965de78f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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://soxebez.ru/strik?utm_term=what+is+the+power+of+the+mind+stone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383802/normal_606e00b76db2d.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/3891042594.pdfIn PDF document text
    • http://zedukibawubige.22web.org/nogibif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_60368176de0d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5fec9dab02427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_604cdb9cd1a75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368998/normal_5ff888f792396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_605c2b893ad80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fc9619533702.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/what_counts_as_a_run_in_cribbage.pdfIn PDF document text
    • http://kadimadifunomox.rf.gd/21354278132.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_169035f9bd3f40b5a438b05fa60e483f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojonuta/65028284284.pdfIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_076c19a7d34d4ea381559daf66031af9.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_ff3579615ecb46629e45243df67f441c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/how_to_write_poems_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/lonedefabipetewij.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/amabile_giusti_libri.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_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 5352 bytes
SHA-256: 89cd9d1d06ff9bd43918bfc4eb8034c9681f6f9ad8e049393b451bb98e921460
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 12020 bytes
SHA-256: 48a36c163053ba1d2ce505dc19b3ec96caa7faf05c9091a60813d2e7b8d26546

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