Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb474bf3765e217…

MALICIOUS

PDF

73.0 KB Created: 2021-01-05 06:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6cabdb069be41332b2e1f5d5702d1dac SHA-1: b934f96c227ea5a5a18ca28a68debd639824906b SHA-256: 3fb474bf3765e217a6219e4264c9cbd31f61a8bcab0b58f4413f94ba4252fe95
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 0.9997

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://trafficel.ru/aws?utm_term=able+resume+templates+for+microsoft+word PDF link annotation
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/lemomuwerife_xoberoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8a32c6121a7.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/57fd60a6-c3e7-49f9-8d60-d3c4e9716c23/18721745730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16148a40-22ac-4152-ac6b-b221df426d88/84721091399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42e85fb-96a3-447e-98e9-f3064c3ea223/managerial_accounting_solution_manual_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997a12ac-d5d6-416a-b91f-e77a4892cc49/fuwonujot.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/50874781458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c875695f-91fe-4009-b063-971bb57e5094/37310746536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c06d729-5452-4245-ae56-225d6c6385f4/61469222097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2db809-3f76-464e-81a0-227d3a33103e/powubus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd928ad-dfd7-450d-beb3-37c2216285be/9974251663.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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 5520 bytes
SHA-256: b0e617fe49b13f564e1ac3161559185a53621f357cf6a3b4b5a1064b72d48dc1
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 10812 bytes
SHA-256: 1b2e79ab5afa6dd2f3c075972b37490d5be4cf7f237d553a635195192a73021d

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