Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a56dd1b2fecad1e…

MALICIOUS

PDF

87.7 KB Created: 2021-03-31 11:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61a9e2830acc2f85924f68e97f86a739 SHA-1: 2eb3552128801efb6aa4e5080b62fbabce3abd3f SHA-256: 6a56dd1b2fecad1e0ad67ec979ef13ee803d17f0a501feaab1fb0af08498c8e8
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', which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=american+cursive+handwriting+pdf
    • https://cdn.sqhk.co/pozigafo/idhcieT/space_marshals_mod_apk_revdl.pdf
    • http://websporizle4.com/94882377381u4tej.pdf
    • https://zuzunavodezap.weebly.com/uploads/1/3/0/7/130776081/3b463bc308e.pdf
    • https://cdn.sqhk.co/daladovum/hjjjem4/jungle_animal_hair_salon_2_games.pdf
    • http://chebsvet.ru/chikni_chameli_full_video_song_1080pz7198.pdf
    • http://goshop32.site/colorlib_admin_panel_templates1ihfl.pdf
    • https://cdn.sqhk.co/lituxopevuk/p7U8get/texija.pdf
    • http://biotringel.shop/782543268588v7bk.pdf
    • https://cdn.sqhk.co/xijogedobu/igyVgjH/37335569779.pdf
    • https://cdn.sqhk.co/nogawevorus/iaaAjjb/boat_driver_license_texas_requirements.pdf
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/fapaw_ruvesurokuw_kaxebizej.pdf
    • http://wegansit.space/acorde_eb7_pianomdrst.pdf
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/eb03854b37ea543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e98ae65-2f25-4c54-b166-eb8b6a0587e9/what_is_the_meaning_of_teeth_falling_out_in_dreams.pdf
    • https://s3.amazonaws.com/xalasawu/how_to_thoroughly_clean_a_keurig_coffee_maker.pdf
    • https://s3.amazonaws.com/jiwisi/tijijakafekiren.pdf
    • https://s3.amazonaws.com/nokiva/gazovefanotar.pdf
    • https://uploads.strikinglycdn.com/files/b9cdf1e2-baa5-49a6-91a4-48f9d7fcbcf5/28562452140.pdf
    • https://s3.amazonaws.com/visagogijulep/rsmssb_computer_sanganak_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/430b21f5-6b73-4644-90eb-33d504417d52/66962393720.pdf
    • https://uploads.strikinglycdn.com/files/096b99ef-cde7-407b-a7e6-a47bf2425c6f/jesutuzuzaxe.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/mofiderasu.pdf
    • https://s3.amazonaws.com/fomaralunex/cholo_paltai_bengali_movie_free.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_off000117a9.bin
e628db4bcd45f1cd8b9cf72b801299f0c8f45cf656cdae36de66727ee6bf38fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 5680 bytes
font_01_sfnt_off00012ae4.bin
2d34bd14a486856ca0b88683df9cb88f8af180fe4b5c1276feec330a426e138c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 11652 bytes

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