Malicious PDF — malware analysis report

Static analysis result for SHA-256 0146ac329b321677…

MALICIOUS

PDF

98.2 KB Created: 2021-04-28 00:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29af036fa31d911957b08b6236b3fbc5 SHA-1: 79b7da4b4ff90368f0c4393f73e3b663938fb0e4 SHA-256: 0146ac329b321677687522fc37490c9d2c9916bb502ca21885f51396ad4b1709
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=tornei+poker+live+gennaio+2020
    • http://mosquito.codes/adobe_premiere_pro_cc_2020_for_freewoleh.pdf
    • http://siankaanmexico.com/21108630784nuw6y.pdf
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/202595.pdf
    • http://raisinsapp.pro/samsung_m2825dw_toneryptrr.pdf
    • https://mologikonazo.weebly.com/uploads/1/3/4/7/134706863/nelulavusezi.pdf
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/5861196.pdf
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/c2f76f35a.pdf
    • http://krokoboko3.xyz/actualizacion_android_auto_mazdazin4m.pdf
    • https://tuloforukidape.weebly.com/uploads/1/3/4/7/134752744/merizalojareguni.pdf
    • http://generatorsale.ru/792697401123ys6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5580843a-1385-4dec-9e3d-91e304bc7955/resumen_del_libro_romeo_y_julieta_por_capitulos_wikipedia.pdf
    • https://s3.amazonaws.com/panalipolifod/android_studio_modify_textview.pdf
    • https://uploads.strikinglycdn.com/files/086cce4f-4aca-4df4-bda4-d47533abbef2/70246766762.pdf
    • https://s3.amazonaws.com/widofafane/the_book_of_yeezus_author.pdf
    • https://uploads.strikinglycdn.com/files/37ecd2b3-6541-44d5-b40c-98aeaf1e246b/the_red_umbrella_chapter_summary.pdf
    • https://s3.amazonaws.com/perurulexi/zaxula.pdf
    • https://s3.amazonaws.com/pipaneku/common_meter_reading_instrument.pdf
    • https://uploads.strikinglycdn.com/files/c2dc4077-cc22-47cd-b389-101d445cebc9/whats_another_name_for_daybreak.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/7893428875.pdf
    • https://s3.amazonaws.com/tonisefoteka/what_qualifications_do_you_need_for_a_carpenter.pdf
    • https://s3.amazonaws.com/sorogamat/what_are_the_best_call_to_action_buttons.pdf
    • https://s3.amazonaws.com/setikizo/2008_chrysler_sebring_convertible_owners_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d96.bin
a61ceb93142601a0d5d8f8dab290b4f35e1a9e946e6d91e4baf5d0bfd75edcd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 5156 bytes
font_01_sfnt_off00014f40.bin
543dd1d72f9899da00cd32fb5f9e36eac71570c1003cdad637f526143ca3bc7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F40 12840 bytes

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