Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a9000e7a1d0ef8…

MALICIOUS

PDF

76.7 KB Created: 2021-04-01 10:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0afb9b49effe28b2d8acf9592b521a95 SHA-1: 711bbbe9ad360671ce47efea357c663e0648815e SHA-256: 38a9000e7a1d0ef86a900df80a68244774155323a51334261eaba219fe349740
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'soldier support activities army study guide', intended to trick users into visiting these external URLs.

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://midufefew.ru/wix?keyword=soldier+support+activities+army+study+guide
    • https://cdn.sqhk.co/jagapifa/vwNjjha/75650827189.pdf
    • http://xitodefigatefuj.medianewsonline.com/durirobagatizabu.pdf
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/wafawofifa_nibidaku_ziralesaj_mitukoxofoxafu.pdf
    • http://lupelisizi.medianewsonline.com/polk_audio_soundbar_remote_programming.pdf
    • https://cdn.sqhk.co/badaxiloru/g8ha6jb/word_search_games_word_search_2020_free.pdf
    • https://cdn.sqhk.co/pibegufuxova/gghjfie/15885533559.pdf
    • https://cdn.sqhk.co/semiwewedazi/jffpgje/ikea_furniture_store_location.pdf
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdf
    • https://tutowori.weebly.com/uploads/1/3/5/3/135317166/f354e81d40d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_facb9de0ff854d0cbc004f462c23b929.pdf?index=true
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_f5663f3b74fe4e8ba22954ca7429eff0.pdf?index=true
    • http://jimarol.myartsonline.com/sugajevawugulibas.pdf
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_31d100aba02249ef864be58d7c161cc3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f4fe785-8a00-47d4-8db2-969753ae011a/4331008574.pdf
    • https://uploads.strikinglycdn.com/files/48aad867-745a-4aba-a5a2-12d5a2af4303/mike_meyers_network_n10-007.pdf
    • https://uploads.strikinglycdn.com/files/97053ebf-16d9-41a3-b71c-18f651ac5ff8/26542956876.pdf
    • http://zuputes.atwebpages.com/skyjack_3219_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/faa6c590-ed50-4855-b3cb-c087137c0875/ruvegaranixokobokerar.pdf
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_72d2d9a1f71148c49978b48c3af3c3eb.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_288e68064c9343738c4d7ab8cea09c32.pdf?index=true
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_dc642c653814438a88ec19025f227acf.pdf?index=true
    • http://zipulosi.atwebpages.com/noxoretejixi.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_off0000edc9.bin
4fa3015f32a94e7eb8262b9ddedf5f19271986ffad115cab346d63c47244dba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 5656 bytes
font_01_sfnt_off00010104.bin
21596351128a7432f501e97dfe5737f9ac4f827709abe1426f0f35533a834552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 10748 bytes

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