Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bcb90b04ea1625…

MALICIOUS

PDF

87.7 KB Created: 2021-03-22 10:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f1c43a74a0c4c51790701180a4b165d4 SHA-1: 4387e978cf1b693e7e2d2d30ab0164b60fdbe4fb SHA-256: c9bcb90b04ea1625711ac17582eac4c62fa219144196dbcb44d8eb1f10d1dc6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a significant number pointing to PDF files hosted on various domains, suggesting a link farm or distribution network. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=danny+boy+sheet+music+piano PDF link annotation
    • https://cdn.sqhk.co/bipadifudame/gq9ibUj/daviruranisadajo.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/193296fe03f.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/KJgcihe/nascar_high_speed_record.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/vevune.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/dDqjiYG/skydiving_near_me_under_18.pdfIn PDF document text
    • https://zijobezugol.weebly.com/uploads/1/3/2/6/132682913/fd3c248195f391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_0969ece3b2ff4b12bc29ad12101aa7e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/bikewo.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6beaa086026a4fa786f94928f78d838b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/aldebaran_quest_guide_ragnarok_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167d0494-4928-4c92-82c3-b78f8312904a/polaris_280_sweep_hose_attach_clamp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c3f251-ea48-4dd7-9c45-b111aab4c391/11344453467.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/35357286065.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/27247929357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772b25ce-4253-476c-9bed-a31f9048f80f/comprension_de_lectura_continuidad_de_los_parques.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/45887813064.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_cf7d412ea6134807a09a6f12a3d334e3.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_72cb86975bca46ff88220b7a5665ee75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8428a7-48c2-48d4-a849-a3e07c570be4/2005_honda_pilot_door_lock_issues.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 5288 bytes
SHA-256: 0a4e83f7e8ed24c8278d27a920c92db77c3d2dccb2bef657c3e7c01e0d0051ba
font_01_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 11504 bytes
SHA-256: f36334f8dbb01dbe1942edbb94cd3b035f31094e096d09ff3376adc9237405cc
font_02_sfnt_off00013c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C90 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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