Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1384824b8e173b…

MALICIOUS

PDF

90.8 KB Created: 2021-04-30 16:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 157ac4feef9c4b0939ada5b5ceedad18 SHA-1: 982f97114ce631d0f7ceeabeb73d2c79f9914860 SHA-256: 8e1384824b8e173bfdbb19af320e5d31d43bb0cd7ed377a95d57877abad68d34
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 hosted on dynamic DNS services or file-sharing platforms, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=what+scope+rings+for+marlin+model+60
    • https://cdn.sqhk.co/voravaxa/HTyRibi/49844588000.pdf
    • https://cdn.sqhk.co/safubuguva/jghhQhh/ravensburger_puzzle_1000_disney_gruppenfoto.pdf
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/a475ef1a476.pdf
    • https://libexezelidod.weebly.com/uploads/1/3/1/4/131454359/3578458.pdf
    • http://lugodapamaj.mygamesonline.org/lopaxezobuwawavafivebib.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://cdn.sqhk.co/dogatefi/xja1ibF/lucky_time_win_rewards_every_day_apk.pdf
    • https://pirulilepeno.weebly.com/uploads/1/3/4/0/134040853/8335918.pdf
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/5573349.pdf
    • http://zokoxakabu.medianewsonline.com/ejercicios_adverbios_de_frecuencia_en_ingles_1o_eso.pdf
    • https://tufamivobanode.weebly.com/uploads/1/3/0/8/130814219/litumubisibowewi.pdf
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/bb5bc046d2dd0.pdf
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdf
    • http://devgame.design/lazowesamuduvulasenass95n2.pdf
    • https://cdn.sqhk.co/kisereta/5w2jgia/biceps_clicker.pdf
    • https://cdn.sqhk.co/zifalulog/LJSchjm/87793664574.pdf
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/301981.pdf
    • http://cmb-societe.com/nccn_guidelines_uterine_cancer_2019hgon8.pdf
    • http://roskycnmx.com/kafejimogaliwafirimudawaddi4kk.pdf
    • https://dimitosakusefix.weebly.com/uploads/1/3/4/6/134631941/zejivub-wudolugunevudel-zixulisixeva.pdf
    • http://graatorama.fun/percy_jackson_characters_watch_the_movie_fanfiction6i248.pdf
    • http://tijukilebag.getenjoyment.net/para_que_sirve_el_jengibre_con_te_negro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bopubedoru.myartsonline.com/cancioneros_para_guitarra.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_off000121e7.bin
787d3e4055fbe2f47a7507122fe71d126645ba731b0d2557a2035e3bb4239136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 5876 bytes
font_01_sfnt_off000135d0.bin
babe000e0d3ef637096333fbf5a98629b3b6c5e4c61459fb0fc7846afdfe1374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D0 12088 bytes

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