Malicious PDF — malware analysis report

Static analysis result for SHA-256 360a76cada4847b2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 23:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53d0a3f8efc93984b3ed0dd96d0b9c1d SHA-1: 6df81924effafbc3a09b42d6644ce371bf3667ce SHA-256: 360a76cada4847b2c07d8cb37bd45fdb816d889cf6d6cf29c8d00199e53a70d4
156 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 document contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary lure appears to be educational content, specifically a "secondary math 1 module 8 lesson 2 answer key", which is used to disguise the malicious nature of the document and encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/wix?keyword=secondary+math+1+module+8+lesson+2+answer+key
    • http://sesizuxewewax.mygamesonline.org/principles_of_naval_architecture_series_intact_stability.pdf
    • https://bagosuberabuvi.weebly.com/uploads/1/3/4/6/134681771/wagerezinuvebad-kivenava-vuralimalavu-fuwigowo.pdf
    • http://tidirakozodawon.getenjoyment.net/maya_angelou_poems_woman_work.pdf
    • https://romidawuro.weebly.com/uploads/1/3/2/7/132712233/6514596.pdf
    • http://sibogufurab.medianewsonline.com/9131005649.pdf
    • http://nopowajowopu.iblogger.org/jofalixazujafavalezap.pdf
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/0ce0c0e1c357a3c.pdf
    • http://ludovudupe.iblogger.org/80135497154.pdf
    • http://tebiweja.iblogger.org/sisijifamuf.pdf
    • http://dotenipago.medianewsonline.com/jazzy_select_battery_size.pdf
    • https://lafezarawowaw.weebly.com/uploads/1/3/0/8/130874252/zalidibutof-rojatajuk-torasunosip-debasemit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/446d10c6-a939-4e50-a3ce-d5b64322aa5e/how_to_do_multiple_math_functions_in_excel.pdf
    • http://fetekovabu.onlinewebshop.net/33721343492.pdf
    • https://uploads.strikinglycdn.com/files/5a2d032f-0409-463e-991c-6e4f6ed7a6fe/where_is_wps_button_on_netgear_nighthawk_x10.pdf
    • https://uploads.strikinglycdn.com/files/3df2d7fc-d193-4fb3-b471-d63a4c0dff5b/noxidinuvo.pdf
    • https://uploads.strikinglycdn.com/files/a3d0a45b-9f06-48b3-a5d6-6fa4d430c818/7613770547.pdf
    • http://fudewalazakukug.epizy.com/bootstrap_template_simple_portfolio.pdf
    • https://uploads.strikinglycdn.com/files/b14e7026-306d-4f7c-96c6-30b2aad511df/mujoranufupid.pdf
    • https://uploads.strikinglycdn.com/files/9a74b4c6-53bd-47b5-9efc-1655c481ea9b/agatha_christie_poirot_season_12.pdf
    • http://zulolabopel.myartsonline.com/fokizokav.pdf
    • http://desigaweru.myartsonline.com/lisado_bacteriano.pdf
    • http://nologivarikej.epizy.com/fraseologia_aeronautica_en_ingles_oaci.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_off0000f0bc.bin
684c3b5d27653de03a01e95c966a9bf348ee9f05d7e894d05d4a751a69da7906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 5920 bytes
font_01_sfnt_off000104d3.bin
b1b28b71e07701902684e255eeabf70fed5eb3b481e99fce32eb5d5c9a6d1af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 10320 bytes

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