Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b24820cd11b7d8…

MALICIOUS

PDF

83.0 KB Created: 2021-03-11 00:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f34f6c52cd9ee54e01f28b7f1b365739 SHA-1: 942518e0f6ba615290cb8f61c0326659be3c6a29 SHA-256: a1b24820cd11b7d8ea4834f33405ca0525df362a3a4f2257c14d6676d18e6327
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a 'link farm' pointing to a large number of PDF files hosted on various domains. The primary URL, 'https://nipisod.ru/wix?keyword=roblox+piano+sheets', suggests a lure related to popular search terms. ClamAV detection and ML classification indicate malicious intent, likely related to phishing or malware delivery through the linked content.

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://nipisod.ru/wix?keyword=roblox+piano+sheets
    • http://dobofozepop.mygamesonline.org/el_himno_nacional_de_honduras_y_sus_7_estrofas.pdf
    • http://wumomotetidofe.getenjoyment.net/remington_700_sps_reviews_ratings.pdf
    • http://dajobod.getenjoyment.net/dometic_comfort_control_center_2_thermostat_troubleshooting.pdf
    • https://vefenebef.weebly.com/uploads/1/3/4/8/134885139/5688108.pdf
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/6e0f423fc87830.pdf
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/rumewupo.pdf
    • http://pifedalune.medianewsonline.com/ruger_sr22_purple_grips.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sojisij.epizy.com/gorolunokipovukusazun.pdf
    • http://semowomeso.onlinewebshop.net/how_to_disassemble_a_whirlpool_oven.pdf
    • https://s3.amazonaws.com/tinezedu/9258844944.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/saruzukisaraw.pdf
    • https://s3.amazonaws.com/ninazarila/post_apartheid_education_in_south_africa.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/reading_worksheets_for_grade_1_filipino.pdf
    • https://s3.amazonaws.com/mojivikapeti/how_to_set_a_1440_sports_watch.pdf
    • http://xoponupesede.epizy.com/accident_report_bureau_albany_ny.pdf
    • http://nenenadixipuso.rf.gd/axiom_of_dependent_choice.pdf
    • https://s3.amazonaws.com/joterige/mutejiwukodumemaka.pdf
    • https://s3.amazonaws.com/dudujopixejikug/97613300926.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/sir_anticoagulation_guidelines_2018.pdf
    • http://fokibuzevurir.rf.gd/silver_eyes_graphic_novel_free_read.pdf
    • https://s3.amazonaws.com/mexesazaxasa/critical_ops_mod_apk_ios_no_jailbreak.pdf
    • https://s3.amazonaws.com/xukirizugukugi/53035936814.pdf
    • http://sabinozugi.epizy.com/osha_root_cause_analysis_form.pdf
    • http://gejopap.rf.gd/29454363715.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_off0000f75a.bin
745819b6d8551abb2771b4a4e60d60ed0a14fed004c5919c1a9e872e2f8842df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 5024 bytes
font_01_sfnt_off00010872.bin
38ea3152a88a53164b74fc848412319f59140f831c981f43e2666a5db5f7d5ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16980 bytes