Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3e101de1009a23…

MALICIOUS

PDF

76.3 KB Created: 2021-06-02 17:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 05fe68494ed3b69fabbacb7195c9009c SHA-1: 54a23a7977d91571461329f196096d6f9f7c8083 SHA-256: 3c3e101de1009a23deb375c5f537a3dab16d14ecdf6e5128ed123cd7ec2858e5
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 0.9999

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://vilenefex.ru/123?utm_term=all+right+justin+bieber+new+song PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4369626/normal_60aff41ac54da.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/lexumovewebebe_pedevagifosazog.pdfIn PDF document text
    • https://terimigekebala.weebly.com/uploads/1/3/0/7/130738799/0702d1fbe.pdfIn PDF document text
    • https://ferafavobob.weebly.com/uploads/1/3/4/6/134671558/zanekimotebin-pegobugow.pdfIn PDF document text
    • https://jiwefirufij.weebly.com/uploads/1/3/4/3/134370204/jezoseloz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413231/normal_604faaf2257f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_60651fac1ed41.pdfIn PDF document text
    • https://rawubewo.weebly.com/uploads/1/3/1/4/131405976/xunatonulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwazilizos.pbworks.com/f/automatic_transmission_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5aca078-3354-47e9-92a0-25edded5430f/jezopipepagalolokomeded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7508e173-878e-4ec0-a2c4-71acb5c5963b/how_do_you_day_trade_bitcoin.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144413280/panawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba352d27-c528-471c-94b3-e7be33390e99/john_deere_ride_on_mower_seat_cover_nz.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/fesuxanezidurijab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a3ae55-91d9-4c54-83cb-160044467564/aquasource_1-handle_tub_and_shower_faucet.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/4076784849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fcd0ecd-4c13-4374-a2cd-9194f83ef73c/reviving_ophelia_full_movie_online_free.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_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 5036 bytes
SHA-256: d2c212557642280f42b98d9491b3ccb97b3445404231aa67fd177d8d760a94d6
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11444 bytes
SHA-256: 0b0238999562e9af22d64e99893233577b2c9b5e139d1c4e6f1224d69f1bbcbc

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