Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffef1d6eab23689…

MALICIOUS

PDF

72.2 KB Created: 2020-12-16 19:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b2256050ed0fc5a820f4f808e63f0d69 SHA-1: 22650f602e507b264a7e298bdcd1b6ad44b2b379 SHA-256: 4ffef1d6eab23689a2f12334f5e0468ee40b040f69c1c0b81deac89ddba1f33c
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/strik?utm_term=mount+and+blade+warband+guide+ps4 PDF link annotation
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/sakepozunefugosag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5fbfcc3ca0254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fa6642b1c14d.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/40aea2c1-b8e9-4b92-8e8d-2796ddf8e87f/55602307285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79167ab7-ad16-4db6-9fe2-108cf4ebd170/34201504534.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc591165e8e827d42ad8ebf/t/5fcd182b662d5e24e0a8a027/1607276588345/faraderanapon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90cdece5-d6ce-4296-b4cb-efc23e5cebce/xutejisewawogaban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8c0262-95a5-4573-be65-5a306faf0080/tisogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c8a9e6-b5af-4c56-a911-53cbe5830d1c/pusadit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e73570-1b01-4ca1-b3cf-3126e0c19d33/junavowuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38312591-2ced-4500-9805-bd738dcca6cc/download_connectify_2016_full_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73907c30-42d1-48cd-90e5-7c25249645e0/libro_de_tablaturas_para_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c912eb9-a1bb-4757-a57e-0660c34715bb/chemical_shift_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73a8c40-2c2c-4486-ab7a-d1fbb2adf2a7/watch_kung_fu_panda_online_free_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8cd028-c219-43cf-9760-dea73d422ef8/nike_force_sky_high_sneaker_wedge.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_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 5452 bytes
SHA-256: 7f1246165c841febda82c0eccd3a3bb727d43b1b301371adb2cf13f1b0c6ca07
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 9596 bytes
SHA-256: 6b47d1f8f8dbe39be55e323a3106e27916c20dfa85040aa59c412f90b04f3868

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