Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d935f7b9ba087f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-01 01:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 22bfe720857fd84be7f1bb45de8d7c29 SHA-1: 058c51a59cbde84e3e9c76becc5303d0982b7b5f SHA-256: a9d935f7b9ba087f0b638c34d5b3f893ff47c369007a8eefe314004f1fc68af4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. One of the primary links points to a URL that appears to be part of a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware.

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://jottigo.ru/award?keyword=how+to+write+an+outline+for+a+novel PDF link annotation
    • http://spiritstudio.ru/43047654307095qf.pdfIn PDF document text
    • http://parrrtner.xyz/dish_network_remote_setup_to_tvesld8.pdfIn PDF document text
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/vunagi_jutikexubime_dasoba_nuwotu.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/46945426293.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/problem_solving_process_steps_in_social_work.pdfIn PDF document text
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/luxobuta.pdfIn PDF document text
    • http://rewita.fun/mac_os_x_catalina_isom6gy4.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/uibjjR9/acrylic_nails_short_blue.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/hcWjcy6/scrabble_cheat_spanish.pdfIn PDF document text
    • http://aromaita.space/ufo_vpn_android_4._4._4r4o2p.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/jnhcXij/jagirabedus.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/jodabiladezot/sisuvuk.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/photoshop_calendar_template_2018_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/sql_timestamp_format_milliseconds.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/trane_air_conditioner_installation_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/asphalt_9_ios_and_android_multiplayer.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/moses_maimonides_quotes_guide_for_the_perplexed.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/tevovimerew.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_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 4576 bytes
SHA-256: de90f7ff5c07b64ca9abcbc7f20e71a94ca63667f0616ad1bb83a6d07aad670a
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10476 bytes
SHA-256: ac16faf3eb6025c1b35f08ecbf1d6a232577fe8959d2d128a79ce9f4ece532b3
font_02_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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