Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67bf3db9930b263…

MALICIOUS

PDF

77.8 KB Created: 2021-04-28 14:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e9f5b2a351205e9b4b69d87f582783b2 SHA-1: 72ae18d2c11fb42bf5c9e33b8a4cbe39b2b3a625 SHA-256: f67bf3db9930b263dd0191df90bb733c190464ff865fa4341bc6f5161122df94
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 0.9992

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://xezojetit.ru/strik?utm_term=how+to+start+an+essay+about+book+report PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501383/normal_5ff3b9e2a1e60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5fc85b199c0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6034e99493bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_6015e93c24629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_60552b61d0f89.pdfIn PDF document text
    • http://fitokaps.xyz/how_to_fix_xbox_360_update_failedy1246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_6049448513c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_5fd0f4a035805.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/lord_of_the_rings_tv_series_cast_characterstf5cv.pdfIn PDF document text
    • http://gufutaca5.xyz/76610647093rad4o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fe6bf7403e44.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/077983ba-7537-4e62-a8a6-5dabbe8b51d6/97630285426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3060ba-cfad-48d8-8909-d071a4789bc0/sig_p229r_40_sw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e81614-cb7a-4c87-954f-2b8396e5b5b4/side_by_side_45_1911.pdfIn PDF document text
    • http://tiwowuda.epizy.com/45288239920.pdfIn PDF document text
    • http://dejamatokato.rf.gd/gitedixap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8ddebc-c5d7-4744-b097-069806648c22/vaniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2973e0c3-49bd-4f90-8413-49b99f68750e/20645191615.pdfIn PDF document text
    • http://goxekeparij.epizy.com/musate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e365a30a-45c5-48ce-be3d-79302a136080/pet_sematary_2019_film_synopsis.pdfIn PDF document text
    • http://nonepajurela.rf.gd/79606827466.pdfIn PDF document text
    • http://kajufikuxididon.rf.gd/what_does_no_abnormal_findings_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa47d3f-01f9-43e1-a50c-a10c40c75dc0/turizogazi.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_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 5140 bytes
SHA-256: 1eae2ae64b26f1968323c3ab9c5d89a619a804961a59a8e90dcb292c48199a00
font_01_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 11220 bytes
SHA-256: 2fd8933b139e084b32483bf3227ace353a20323e5f827d00f23f1792eafdf441

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