Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b4c352bbbe4605…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 05:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 50a41f9fb0196127ad21621a8ba611f8 SHA-1: 95789205e584745d58590a97ff07831beb952415 SHA-256: d1b4c352bbbe46053ec92d0d03a8599f5e76e1c5f547fdf942362725e0950bda
156 Risk Score

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-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.
  • 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://ponafet.ru/123?utm_term=fountainhead+palace+guide+sekiro PDF link annotation
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/1bf59b6d12b.pdfIn PDF document text
    • http://verifiedbadges-form.com/what_should_my_1st_graders_know_in_mathc3p5a.pdfIn PDF document text
    • http://nopisodozig.66ghz.com/best_1_year_bible_reading_plan.pdfIn PDF document text
    • http://choosemadam.site/what_is_deferred_revenue_and_expense8ayu8.pdfIn PDF document text
    • http://pinerapidsrr.com/icons_jdr5t9w3.pdfIn PDF document text
    • https://vijunefuk.weebly.com/uploads/1/3/4/5/134588972/5966573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xixonu/megirimu.pdfIn PDF document text
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_96dca342658b4eaa9cc5e757652891ec.pdf?index=trueIn PDF document text
    • http://sugizujesel.epizy.com/xabavofubivavuxar.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_bc1e01052a6a449f9f7c2b995097fabe.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_56ca86d6b49f44059a400c3259ac1560.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/north_coast_salmon_fishing_report.pdfIn PDF document text
    • http://doneresipudeb.epizy.com/how_many_types_of_interchange_fees_are_there.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_e81e0258b2734946bdd6dddabdb0abfc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befafuni/bleach_mobile_3d_apk_offline.pdfIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_786a2a476d754fa1b7c9163cea2c05a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/how_to_become_a_fbi_swat.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/xabil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 5328 bytes
SHA-256: cf275a61edda66afafae20e51f0512074cfd5664904a4f28ac8532375d7439e3
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 5356 bytes
SHA-256: f902763de4a329115d16c973dbdc8ff84535b29358c45070fdcd77dc1b216fcb
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 11560 bytes
SHA-256: 6cb85589e9cce874c4fc8951103b0fb071c959a70d7cb6b20250ece7e8571917

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