Malicious PDF — malware analysis report

Static analysis result for SHA-256 4144c9f072c3f0c7…

MALICIOUS

PDF

74.6 KB Created: 2020-11-14 12:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 275bf686eb562832eceffe82d4c362be SHA-1: ddd397a00a32f0b204eb974509709dfbd36592ec SHA-256: 4144c9f072c3f0c7ddc660ad6473a3dbc88854bb95310088ff2f2fb5497bb3b4
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://trafftec.ru/strik?utm_term=roland+camm+1+cx+24+driver+windows+10 PDF link annotation
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/709713c784d1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_5f9a828b44eae.pdfIn PDF document text
    • https://gazapaxinu.weebly.com/uploads/1/3/4/4/134475358/gonado-livijibagize.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/477c3af4540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rezugekolaba/grados_sexagesimales_centesimales_y_radianes.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/73351444440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d396afff-aa85-4a2d-9dec-523bdda885d0/flash_super_mario_bros_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d5c7eb-16d7-45b9-808d-2af0413f5c34/audacity_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9ddec5-cefc-4cd4-984b-637598ea1367/kapawemar.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/parallel_and_perpendicular_equation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b980655-3951-4895-b990-0fcfff7c974f/logitech_mx_ergo_plus_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/turners_graph_of_the_week.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 5432 bytes
SHA-256: f3210d3745984b758412f16c8d61229d9330dc75b2b069329cbc8d54473a7875
font_01_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 10660 bytes
SHA-256: 85b60fa78dcf98fecabf5283fb0b3d0e405f5f489e4760ab67fca3599fe96708
font_02_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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