Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b23f96852bffea…

MALICIOUS

PDF

79.4 KB Created: 2021-04-11 09:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 65413b3d26824e0ef778f40f85b49feb SHA-1: b234c499b595fcd5492f1f1e18f5e6c68bda226c SHA-256: c9b23f96852bffeaf28abee785d8a6ebbe114807e74efa5de5a5add1db374d7b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is detected as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, appears to be a lure related to a search query. The presence of external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=what+is+stephen+hawking+best+known+for PDF link annotation
    • https://rugisuvo.weebly.com/uploads/1/3/4/4/134438002/7f4db7baf5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6042cfce933c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497095/normal_6023953c5752c.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/6067153.pdfIn PDF document text
    • http://gakmancreatures.ru/box_profile_fibreglass_roofing_sheets7p5js.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_5fd902f69477e.pdfIn PDF document text
    • http://reweder.site/96082021115xriw7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_60698b3fe4c6e.pdfIn PDF document text
    • http://instahelpforbusiness.com/jakks_pacific_night_vision_goggles_reviewz1mog.pdfIn PDF document text
    • https://pifofunota.weebly.com/uploads/1/3/0/8/130814871/9991570.pdfIn PDF document text
    • https://bekozowa.weebly.com/uploads/1/3/4/7/134713297/f5a9ecfc2b5f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6029990c48e13.pdfIn PDF document text
    • http://gbo.guru/bagufurijumolegusodosxpvwt.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/tetofamuxulil/61360437656.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/inclined_plane_analysis_physics_classroom_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/54583202959.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/faa_icao_flight_plan_guide.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_cdb6189d77024d99964c2c64c768b12c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/perurulexi/casablanca_guitar_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/nizoz.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_b7eb0bc66a834f179a505b08464250f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejeseja/pewekatuvilugetuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/56627639387.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 5440 bytes
SHA-256: 1e8fffab5fbbaae804af830facbf2c7ad37dab9546d685a768ac1b4730521832
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 10712 bytes
SHA-256: eda580b7d9a4d47cc43b0c90c9d1f7cb0d233b56283a8d3c2d20dcabcf6aa1bd

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