Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cf9a851372b33a…

MALICIOUS

PDF

79.0 KB Created: 2021-03-20 23:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa405f4747c98f60b59dce989fc85f81 SHA-1: da7965241c5235ad044cb09d2f4a535cf9028ef8 SHA-256: 90cf9a851372b33afc665aec8a654b080c8ad294550bcc82bea72eeb41b6aef4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary URL identified, https://druttle.ru/wix?keyword=comfort+aire+air+conditioner+manual, appears to be part of this network. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to direct users to potentially harmful external content.

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-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://druttle.ru/wix?keyword=comfort+aire+air+conditioner+manual
    • http://xijulefabogi.getenjoyment.net/capitalization_and_punctuation_worksheets_with_answers.pdf
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/zipirok-tegexajuxoxo-kajotezid.pdf
    • http://mojenisijita.mywebcommunity.org/lagujipuvolomisoxotedo.pdf
    • http://mokemowowove.mygamesonline.org/how_to_put_water_in_a_brita_pitcher.pdf
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/betutanewonuna-togemelawapoxa.pdf
    • http://xovasaf.iblogger.org/warinamekemeviten.pdf
    • https://gavuzidawosowek.weebly.com/uploads/1/3/1/4/131413418/dowijupipanesi.pdf
    • http://gugezebaz.mygamesonline.org/zabakufen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ribitotuv.epizy.com/2019_tamil_horror_movies.pdf
    • https://s3.amazonaws.com/sinamozagemoger/how_to_turn_ringer_off_on_uniden_cordless_phone.pdf
    • https://s3.amazonaws.com/mawesenasijoser/37573456906.pdf
    • https://s3.amazonaws.com/zoromexemuzid/41264932101.pdf
    • http://kapirexazi.onlinewebshop.net/isometric_projection_in_engineering_graphics.pdf
    • https://s3.amazonaws.com/juliziwojatige/promissory_note_format_in_tamil.pdf
    • https://s3.amazonaws.com/saxefi/35610005346.pdf
    • https://s3.amazonaws.com/jazamerijekufol/united_nations_competency_based_interview_answers.pdf
    • https://s3.amazonaws.com/jijari/10726484637.pdf
    • https://s3.amazonaws.com/gebukil/96609332670.pdf
    • https://s3.amazonaws.com/widuxade/wipusukowerizegifure.pdf
    • https://s3.amazonaws.com/rujabepifar/cfa_level_1_books_schweser_free.pdf
    • https://s3.amazonaws.com/wuniku/ziwadabubabenarifezigijim.pdf
    • https://s3.amazonaws.com/rebesudanolo/wokozomu.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_off0000f862.bin
d04dd8a1da33c0c46555df8f97d24c67e0178184d7f609284250dd8f43200a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 4896 bytes
font_01_sfnt_off000108ec.bin
b360cd7af2f53dc21648b36fe700eeae9584fca580adeb3d4b638d3dcb1ab3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 11044 bytes

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