Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8c0c9b4e511119…

MALICIOUS

PDF

81.5 KB Created: 2021-03-21 21:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67d8c6d63ea0cdf6e74b07a0bac55fba SHA-1: dde797a10c08920d98f63fdb14895c71073fe871 SHA-256: 3a8c0c9b4e51111986d45e1a7bf932b43e835b10dea0403f49cbc754fde23c84
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate search results or downloadable content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload via the embedded URLs. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=oxford+advanced+dictionary+download+pdf
    • http://reduslimitaly-official.website/tunetaxazerrqia.pdf
    • https://cdn.sqhk.co/xalibolopov/iahgLhR/dead_paradise_hacked_unblocked.pdf
    • https://jupiretuvivu.weebly.com/uploads/1/3/5/3/135383394/ee0366f.pdf
    • https://kujarubokaja.weebly.com/uploads/1/3/4/5/134590089/pijuvipaditevesi.pdf
    • https://cdn.sqhk.co/guzoladip/Aig4MKc/best_zombie_apocalypse_movie_list.pdf
    • http://meine-gebuhrenfrei.com/manual_prctico_de_psicoterapia814mg.pdf
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/sewenikufexisa.pdf
    • https://cdn.sqhk.co/pulununese/Ajb6ijG/download_upgrade_assistant_for_android.pdf
    • https://cdn.sqhk.co/gudopokobipa/cGifJJt/real_doctor_robot_animal_rescue_mod_apk.pdf
    • https://vuzodafolo.weebly.com/uploads/1/3/4/7/134732359/gilenen.pdf
    • https://vafabifagid.weebly.com/uploads/1/3/4/5/134583570/ralufun.pdf
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/c9ee63.pdf
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/sapesumolaviwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juliziwojatige/fofobezotiwena.pdf
    • http://nivutegem.epizy.com/dork_diaries_books_online.pdf
    • https://s3.amazonaws.com/rovuweraja/ziluzokofitopepe.pdf
    • http://doroxokile.epizy.com/bus_stop_movie_movierulz.pdf
    • http://gelofobomafagez.epizy.com/kiss_the_rain_music_sheet.pdf
    • http://tasopawak.rf.gd/hidden_figures_movie_worksheet_answer_key.pdf
    • http://vuremekewema.rf.gd/nibakorakapipim.pdf
    • https://s3.amazonaws.com/minabiwa/9428726410.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8a.bin
352b9534180ed04a8c34581dea918d385cc4bf02e0b5d5ac515de1d0d29877de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 5320 bytes
font_01_sfnt_off0000fcd2.bin
6b7197277fe3a5fdc002fdc08885fb5daac98a04d4ab2bfab8505e4814b373eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 10428 bytes
font_02_sfnt_off0001201f.bin
8d45f5f417e74c11d54eaee7138901bb4b2498e40dea16ccf89f2c2707c13e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 16544 bytes

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