Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8e33d6735613d7…

MALICIOUS

PDF

74.0 KB Created: 2021-06-08 07:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fccc9032e62bd5b1e25f0e0e18ebb9c1 SHA-1: 05cba2dc8f3a659173c45961289760db0fcd8276 SHA-256: 9d8e33d6735613d74cd044d6d4867f1536f72d9223604e5a5654eace39f709b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files, indicating a link farm or SEO poisoning attempt. The primary malicious URL identified is krisoc.ru, which is likely used for phishing or to host a malicious payload. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/pbw?utm_term=ahmedabad+municipal+corporation+pradhan+mantri+awas+yojana+online+form
    • https://wenadexedodoren.weebly.com/uploads/1/3/4/3/134322255/gonoratib.pdf
    • https://gavuwili.weebly.com/uploads/1/3/1/0/131070236/2981813.pdf
    • https://ladipepisosixas.weebly.com/uploads/1/3/4/8/134898905/746102.pdf
    • https://nodajalij.weebly.com/uploads/1/3/5/9/135990600/jebigezakum.pdf
    • https://pamoxoxose.weebly.com/uploads/1/3/4/6/134656592/migafi.pdf
    • https://vewifofuk.weebly.com/uploads/1/3/5/3/135394013/180e743ef24a89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/912e1766-7387-4b36-84e0-aef28834865f/10858260778.pdf
    • https://uploads.strikinglycdn.com/files/c3785cf4-ad40-400d-a56b-cc119da7bc27/make_up_phrasal_verb_meaning_in_malayalam.pdf
    • https://uploads.strikinglycdn.com/files/7267ed67-ba3f-4350-bce5-78b984726d64/toshiba_satellite_l755d-s5109.pdf
    • http://xexufokug.pbworks.com/w/file/fetch/144804174/21735869163.pdf
    • http://joraxakegeg.pbworks.com/f/how_to_recognize_an_oxidation_reduction_reaction.pdf
    • http://barumena.pbworks.com/f/23878467657.pdf
    • http://zevatirupura.pbworks.com/w/file/fetch/144585801/diary_of_a_wimpy_kid_the_wrecking_ball_release_date.pdf
    • http://ragasegena.pbworks.com/f/jbl_charge_4_vs_ue_boom_2_le.pdf
    • https://uploads.strikinglycdn.com/files/bc3ac50b-ce6e-4bb7-b4cb-345664a83fca/ielts_writing_sample_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/9f1ee7aa-5734-4756-a612-282547df5303/risubukamo.pdf
    • https://uploads.strikinglycdn.com/files/990cc1a2-727e-4cd5-8381-e64c3099f56b/35731990524.pdf
    • https://uploads.strikinglycdn.com/files/c5f48830-6f4b-428f-a7fc-5a389b65e51f/how_to_phases_of_the_moon.pdf
    • http://papedisuk.pbworks.com/w/file/fetch/144799224/como_conseguir_cupones_de_descuento_en_estados_unidos.pdf
    • https://uploads.strikinglycdn.com/files/873589fd-ab7d-4e1c-ad2c-14a63fbfabc0/how_to_make_ground_beef_jerky_in_dehydrator.pdf
    • http://vawijoj.pbworks.com/w/file/fetch/144819561/descargar_hirens_boot_15.2_iso_espaol_mega_gratis.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_off0000e3d2.bin
5fe04a578ce13219576418bf933366b9385714d1a348834ab5034a463f8c23b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 5796 bytes
font_01_sfnt_off0000f777.bin
4271608e9a6ecffbb748f3fc5c9a32b617583bcb72bac276915a78c08d84bab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10176 bytes

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