Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0a8e75f662cebf…

MALICIOUS

PDF

81.7 KB Created: 2021-04-15 00:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4fa51d563ba21e644a898ef4af36cf98 SHA-1: c41a1918fcbf761100c421f53732e1e31e5be5dd SHA-256: af0a8e75f662cebfcc8af19913c94a7f489692f30fede7ef3b70ba2c7616ef1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=what%2527s+keto+friendly+at+el+pollo+loco PDF link annotation
    • https://gujinaberukigav.weebly.com/uploads/1/3/1/8/131856979/lebuvotuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fd2f89979025.pdfIn PDF document text
    • https://xunedoworevesa.weebly.com/uploads/1/3/1/1/131164322/vipogujijowof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5fdc19dda078f.pdfIn PDF document text
    • https://jitemino.weebly.com/uploads/1/3/0/9/130969659/gugotof.pdfIn PDF document text
    • https://putomusozozor.weebly.com/uploads/1/3/4/3/134321488/kiwojafimade_muxotut_xudar.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/spoken_english_download_in_telugu.pdfIn PDF document text
    • http://zanapipok.getenjoyment.net/arsene_lupin_contre_herlock_sholmes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_60102bc7bc1e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_5fe623c8e0342.pdfIn PDF document text
    • https://cdn.sqhk.co/lifupowaseli/ogehgOj/game_online_2_ngi_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/fMidggv/xadufofesag.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/poxutudirufebesilin.pdfIn PDF document text
    • https://sesuzefodapu.weebly.com/uploads/1/3/2/8/132815176/dilavur.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/epg2aEa/56701343294.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/fiaeX66/zadofufipi.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/cambridge_first_certificate_handbook.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/c96f8584-1b3e-4094-882a-892be7a0fab4/dark_souls_remastered_ps5_performance_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7188666-6afc-4463-8c45-ada344fdd205/dodge_durango_shifting_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8903a6-2c07-4213-b473-a99bb5cafdd8/craftsman_125_psi_1_hp_12_gallon_air_compressor_price.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/nexamudoridefavegepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789ad55c-0b82-4c56-bdbb-f3f49c92ed37/python_list_remove_duplicates_set.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/povavutepafi.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_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 5456 bytes
SHA-256: a4022ca9c9c105367c432a2d1cb477d6d902a18c1d0d9121765bfdb74ca0bda1
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 2676 bytes
SHA-256: 311b07020365d4de6830a44094cda5b5398650f0680f3c0694f93b06c79ff87b
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 11876 bytes
SHA-256: e4f78380d9ee4da3a72a4bdf9cf980883cecb5fc8c9c451db0c6bf18f5ea8463