Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb94b583726403ce…

MALICIOUS

PDF

77.0 KB Created: 2021-05-24 01:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb097273c7c1b21a694bdefd2c92b5b3 SHA-1: d8dd169bffe4252aaeba8332ac367c87c532b217 SHA-256: cb94b583726403ceff1c7d04cc7d2311efcb8e3796fea5c7ce73525ce5788c9e
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://nipisod.ru/strik?utm_term=oraciones+con+yet+en+ingles+y+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428078/normal_60675e362467a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_604364deb4206.pdfIn PDF document text
    • https://kakewexetoza.weebly.com/uploads/1/3/4/6/134693891/2873449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_600abb1252434.pdfIn PDF document text
    • https://xobiduri.weebly.com/uploads/1/3/1/4/131437628/896b3207f9f8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6044d6e9b8f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_601da07d13043.pdfIn PDF document text
    • https://kurajefofukagi.weebly.com/uploads/1/3/4/8/134895289/5357560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_604928b87af56.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/zuvovoxigumuz/butidowonapebusa.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/mdr-zx770bn_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19a26da-0ccd-4c91-b7dc-43d546ed8957/21888063110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff8c641-800d-4fd1-9643-7742f584a5a0/norifosuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/factoring_polynomials_maze_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/burning_bright_john_steinbeck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597f3e30-728b-4119-9471-0d1e42c3d8a6/introductory_econometrics_a_modern_approach_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/mobile_accessibility_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/nupadirezumewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59eb0717-1840-4b25-9f20-251a1fc2e8ce/blender_2.8_animation_tutorial.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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 5440 bytes
SHA-256: cd288fea7171f7c22ab5ffce1173d3eed0dc732cd6ef734d0b64991e0df18c1b
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 11980 bytes
SHA-256: e1644fcf4766a9590750a4cc039f03fd184e00ef4358a7a4bc669dabfae08b6f

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