Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c36699bac59d4e3…

MALICIOUS

PDF

105.6 KB Created: 2021-03-24 09:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f492b989d3722087256372346f69d0a5 SHA-1: b096a2bcc181739fa68ce30966cae541d24ff377 SHA-256: 6c36699bac59d4e3ec416366af18fb917989d9a1bfe2c088023b0f3fd4e6ee65
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host numerous external links, likely to distribute further malicious content or phish for information. The presence of embedded URLs and the document's structure point towards a phishing or malware distribution scheme, potentially using a link farm to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=introduction+to+quantum+mechanics+townsend+solutions
    • http://sabewasarakabi.iblogger.org/clasificacion_del_derecho_publico.pdf
    • https://cdn.sqhk.co/kekelivig/fmjggjG/rolitopise.pdf
    • https://cdn.sqhk.co/zarejesorufo/Yhijbty/suwopupeso.pdf
    • https://cdn.sqhk.co/ludibipimilu/aMjghjC/japan_used_auto_parts_online.pdf
    • https://cdn.sqhk.co/wufaluvete/hggfg9S/45179126366.pdf
    • https://cdn.sqhk.co/dutedape/igXcAhc/football_training_drills_for_under_8s.pdf
    • http://ludoviguboxulu.22web.org/rent_agreement_format_in_word_in_telugu.pdf
    • https://cdn.sqhk.co/zenetofuma/gcUfdhb/59014700091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sawopirorafo.rf.gd/45353341558.pdf
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_887720c7e7634f24bc0a49ae7d6cb953.pdf?index=true
    • https://s3.amazonaws.com/marimejerebo/board_game_templates_free.pdf
    • https://s3.amazonaws.com/kujesulad/cules_son_los_primeros_sntomas_de_la_premenopausia.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_a1ec38b38f9d46c8b145fdd898682b75.pdf?index=true
    • https://s3.amazonaws.com/kevava/uruvam_tamil_movie_tamilyogi.pdf
    • http://gebuzabode.epizy.com/jitevizebo.pdf
    • https://s3.amazonaws.com/piwanisaj/fefinimuzenetajepowenel.pdf
    • https://s3.amazonaws.com/wujapu/91494268411.pdf
    • http://nupakavidowux.epizy.com/al_kahfi_latin.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_off000146ae.bin
74e2db3eb37bf6460ad621395598a067268bbcd42ccab1b302d2f98c78d971fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146AE 5336 bytes
font_01_sfnt_off000158af.bin
9b530d436372054c1a3569f41997fbd00c8ef0e59e9d558d46f49994f901630a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158AF 12692 bytes
font_02_sfnt_off0001838c.bin
f2fe1b341ce625982f6229602509497cf1a9423964c663a7c58f6fce8010e377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1838C 16148 bytes

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