Malicious PDF — malware analysis report

Static analysis result for SHA-256 056b2c08522c23b4…

MALICIOUS

PDF

69.5 KB Created: 2021-03-18 10:37:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5d23a3668d37a3dd06205aa80aab06fb SHA-1: b234555569a15dd85f3e39e44d20a76126bca735 SHA-256: 056b2c08522c23b47c213bf891ab01a3c82d9286371443b5fd2803f8d6b645cd
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body, though partially corrupted, indicates it is disguised as an educational worksheet to lure users to malicious URLs.

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.
  • 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://golowaki.ru/wix?keyword=simple+compound+and+complex+sentences+worksheet+3rd+grade PDF link annotation
    • https://cdn.sqhk.co/govonesed/he3fUd7/spinning_3d_earth_globe_free_download.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/a_fine_fine_school_book_read_aloud.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/gWGkAie/kodijovewezadoge.pdfIn PDF document text
    • https://vasetovomakoti.weebly.com/uploads/1/3/2/7/132741031/d55ef894e1b.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/eiiiaih/doom_movie_review_2019.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/vipassana_meditation_technique_body_scan.pdfIn PDF document text
    • https://jefilixepiras.weebly.com/uploads/1/3/2/6/132681342/sajaz.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/31412796425.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/wtjbigH/93611740158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_0a0233cf8f844ad38903a4d92503c673.pdf?index=trueIn PDF document text
    • http://dozopedatofol.atwebpages.com/gewukedeluta.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_dffa806de2af471696c0bebd3be9ac56.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_1404cf082b0048589ac0a195e7e9dabe.pdf?index=trueIn PDF document text
    • http://kepagewav.atwebpages.com/how_much_is_a_pearl_grandfather_clock_worth.pdfIn PDF document text
    • http://xiramubete.rf.gd/benukaz.pdfIn PDF document text
    • http://wagadepepixapu.epizy.com/65188854745.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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 5980 bytes
SHA-256: 5bef6a3c4e74bd6748be4b2d7b62420d3469ebb4877d36ea03bba675dfd22fa1
font_01_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 10500 bytes
SHA-256: 75a173db882ce5df1c91d8b97a857790a8a6ce8d6588203fac41e0cba0087151

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