Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb84af35afe6009c…

MALICIOUS

PDF

73.0 KB Created: 2021-03-30 09:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5a3f762ff6159f944dddf61971222a71 SHA-1: 416790fa83d144dfd182ec8e0cf538483e1ff20a SHA-256: fb84af35afe6009c8e17c8769626df680fa18e67e2d7fb79a4b85e4b5dd7fd28
156 Risk Score

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-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://dafemum.ru/wix?keyword=katie+sunshine+instagram PDF link annotation
    • http://lavka-karamel.ru/the_diary_of_anne_frank_quiz_and_ans7tb53.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/ggFhaic/do_smart_meters_use_5g.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/ejihbid/14880929354.pdfIn PDF document text
    • http://localdesign.me/trimble_tsc3_windows_10yt8pt.pdfIn PDF document text
    • https://larekupexog.weebly.com/uploads/1/3/4/8/134884129/4c3f5455f.pdfIn PDF document text
    • https://bubituzujolumet.weebly.com/uploads/1/3/4/6/134647672/6629002.pdfIn PDF document text
    • http://rivijataban.22web.org/adobe_illustrator_tutorials_bangla.pdfIn PDF document text
    • http://copyrighytsupport.com/1st_grade_reading_books_freet3x7z.pdfIn PDF document text
    • https://pedesidava.weebly.com/uploads/1/3/4/3/134355179/bac0f32e8.pdfIn PDF document text
    • http://hargotel.xyz/60587386432dkqqp.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/senekivapedu_tipudu_wikurivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/firudegix/what_are_the_benefits_of_kriya_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/letter_f_coloring_worksheets.pdfIn PDF document text
    • http://kavakino.epizy.com/bissell_steam_cleaner_model_1383.pdfIn PDF document text
    • http://lodusebivepakef.epizy.com/19677847710.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/30854379494.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/realistic_colored_pencil_drawing_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/bahubali_2_telugu_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/escort_passport_9500ix_platinum_radar_laser_detector.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/sample_powerpoint_presentation_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/algebra_1_common_core_textbook_pearson.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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5036 bytes
SHA-256: 5a843a2da5629d3128408d3bbb9127f716c89e172f331e4f88393357cc4b220d
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 11316 bytes
SHA-256: f0caa60360bcf1133484c53fbd9bc52391ac857686c205c99002c5232151609a

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