Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5de1a34a3ffa54f…

MALICIOUS

PDF

58.9 KB Created: 2021-01-05 06:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 515ab879123426a99811b3628c03a0a5 SHA-1: e29b42d1fa494c84487c9b101b529fb442cc0615 SHA-256: c5de1a34a3ffa54f98b183e02d11fa835ba2beb39cdb2781d2878cd154c6ce2d
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 0.9996

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://traffnew.ru/123?utm_term=umass+dartmouth+softball+field+address PDF link annotation
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/pexojeren.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/d5313f4.pdfIn PDF document text
    • https://gexoronigiz.weebly.com/uploads/1/3/4/2/134265935/nasizovojeb.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/e34ce4b5-8b61-4930-a290-39fbe201978e/online_shopping_clothes_uk_cheap_mens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6dc2c64-297b-44bc-a23f-aebc7965fe26/lawn_boy_book_jonathan_evison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a78e08-d12f-4572-a7eb-5cf500a02d98/82415284510.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/21235743617.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/work_experience_certificate_letter_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead84215-ca98-487e-be5d-c26e09736e2a/posie_la_nouvelle_anne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d46a64-1837-454f-ab96-a26192f609d5/destiny_2_leviathan_raid_guide_royal_pools.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/exerpeutic_900xl_recumbent_bike_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496adeee-4505-4790-b47c-7c7de153c506/63489108373.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_off0000ae9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9D 5276 bytes
SHA-256: e26c97ff6f2f84e68d060ddcd096fd4b5e61fa69ea094662197bb7fb0d9f46f9
font_01_sfnt_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 9020 bytes
SHA-256: ac19e455c56592e9917095213bb14fb6245aae061430f761b5dddaabdf0e3732

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