Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de60b327e1bf9e4…

MALICIOUS

PDF

73.1 KB Created: 2021-04-12 06:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2e368c1e2db3d37c39435b5ff2a84c98 SHA-1: 5f7c4d1797d3fab620309ac50957829a6d2094f8 SHA-256: 8de60b327e1bf9e4d6bb38e6c9c04428099068399a7240b6f62e8c7afe4e4880
156 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 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=what+are+some+example+of+gross+revenue+margin PDF link annotation
    • http://vuvefezod.iblogger.org/pubejazorewiduzaruna.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/1717464.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/8f762.pdfIn PDF document text
    • https://rigozogukex.weebly.com/uploads/1/3/3/9/133986215/4361343.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/lejitujisuxi_wafedid_juzivepud.pdfIn PDF document text
    • http://ketorebagibof.22web.org/67366015508.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/46ebd962-813c-4dda-9bb3-2d06f4b2f5b4/temple_of_sethraliss_mythic_keystone.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/bufapamulijorenulotoro.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_2955001c5a6b4f2ab11ed7d555e4dc65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/294b2ae5-e0d5-4f21-a2a8-6e9464c47e5f/your_final_walk_through_before_closing.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/83172606945.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_f5115c21a4ca4dd1a35a5507d46c62ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/fajoxibori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24f9aa8-fad5-47d4-a172-eede14ee2b7a/how_to_fix_an_electric_fireplace.pdfIn PDF document text
    • http://simusofitiralod.epizy.com/jariv.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/vogovatavagufobudigi.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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 5456 bytes
SHA-256: c0751393955a7d281fb47c8bec8069c7f61cf8e5d484fa4874a5d7094e6ad810
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 10984 bytes
SHA-256: 2140c805da827a7de23badd8fb2be9a0c87da0aaf8653c8c8bb3975e3861eb0f

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