Malicious PDF — malware analysis report

Static analysis result for SHA-256 3336737326c96743…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 07:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d014e743b870a1bdf90b00c529e99315 SHA-1: 7aea054f5a7c119c91d77802d5efc6a8907627d8 SHA-256: 3336737326c9674364cbcbfadd2503cd2a62b273a052d08cd58f154aae46c9d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with a primary URL suggesting a lure related to educational content. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests the document is part of a scheme to generate traffic to numerous linked PDF files.

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-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://lozipotod.ru/wix?keyword=virtual+lab+natural+selection+answer+key
    • https://xedutorapul.weebly.com/uploads/1/3/0/8/130813372/884e49081d358.pdf
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/marajog-jafataj.pdf
    • https://zelogevoge.weebly.com/uploads/1/3/1/4/131483318/6738ad5869bc.pdf
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/772ada7fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nalujisutu.epizy.com/bootstrap_3_form_control_error.pdf
    • https://s3.amazonaws.com/votawawo/78999359431.pdf
    • http://jufolijab.rf.gd/a_burnable_book.pdf
    • https://s3.amazonaws.com/sirilagewuga/21944573350.pdf
    • https://s3.amazonaws.com/xanunafojuloki/popetixo.pdf
    • https://s3.amazonaws.com/vufuzewasi/bangla_font_for_microsoft_word.pdf
    • https://s3.amazonaws.com/gofilafixu/62720738093.pdf
    • https://uploads.strikinglycdn.com/files/a9b3ecb0-95d7-42a5-b2af-6b44e7e85093/30_day_clean_eating_challenge_clean_food_crush.pdf
    • https://s3.amazonaws.com/difigomisosak/command_and_conquer_zero_hour_online.pdf
    • https://s3.amazonaws.com/lewuli/dixat.pdf
    • https://s3.amazonaws.com/siwixomudit/85547833358.pdf
    • https://uploads.strikinglycdn.com/files/b03e776f-d955-4c4d-ad13-5bd6bb7605e6/fokovotakogiludovem.pdf
    • http://zenoridofagokev.epizy.com/zunorerututiresajude.pdf
    • http://volitiwil.epizy.com/22905215481.pdf
    • https://uploads.strikinglycdn.com/files/465f7076-a309-47df-8f1c-d194fd8c4e0c/what_plates_are_involved_in_divergent_boundaries.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/kixaga.pdf
    • https://uploads.strikinglycdn.com/files/31061eb7-e22d-4827-b819-87dd98f9bde8/kindergarten_reading_comprehension_passages_with_multiple_choice_questions.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_off0000e90b.bin
ddad82765b269d2f2e3c30e7fc01e5600df26fcac64a0957c0a6cabceb7f32bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 5156 bytes
font_01_sfnt_off0000fabe.bin
22491c70e90d72a306971a1bade0ce1c94c8c7f96b94cbf57b993ca4d7b85f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 11504 bytes

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