Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f37ef7457e98d9…

MALICIOUS

PDF

86.8 KB Created: 2021-03-20 03:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e1b89ed50aa47a1c6cd76456e5a427 SHA-1: ef1ddf035ed89dd2700982f330b1f3a29b2ffb7b SHA-256: 86f37ef7457e98d974774eb32c27a8916f74c7d690a91bd24d48b444326d7100
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of SEO link farming. It contains numerous external links, with a primary suspicious URL being https://golowaki.ru/wix?keyword=dna+worksheet+pdf+middle+school. The document's structure and embedded links suggest an attempt to drive traffic to various sites, potentially for phishing or malware distribution.

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://golowaki.ru/wix?keyword=dna+worksheet+pdf+middle+school
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/6d677b050872.pdf
    • http://speak4pro.com/dieta_celiaco13gzj.pdf
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/7326721.pdf
    • https://cdn.sqhk.co/luveruzosu/gfjdgcM/piggy_3d_model_roblox.pdf
    • http://slimitalia.space/american_society_of_plastic_surgeons_logo_vectorgpytk.pdf
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/8f027.pdf
    • https://vuzabevewipa.weebly.com/uploads/1/3/6/0/136087677/modew_bubirikutexut_jabiz.pdf
    • http://miiliioner.xyz/disturber_of_the_heartsvxuyn.pdf
    • http://securityverifiedservices.com/27432958945bx7r3.pdf
    • http://nizuxep.iblogger.org/legekezojaloziki.pdf
    • https://cdn.sqhk.co/kamavedes/jbmihzn/best_29_card_game_app.pdf
    • http://mif-smeh.space/lexojasuwotarud05sd.pdf
    • https://pikisavejalanab.weebly.com/uploads/1/3/3/9/133986241/jojeju-zibovo-zitovev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_47ca03690a304a649371c16594784be9.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_145e3a04e7c645e0b5981217e60f27e1.pdf?index=true
    • https://s3.amazonaws.com/zarelusipofox/rinufesibimavufozuzexe.pdf
    • http://welokaj.rf.gd/star_spangled_banner_sheet_music_for_flute.pdf
    • https://s3.amazonaws.com/pululusodogi/converting_units_of_measure_worksheet_year_4.pdf
    • http://jasukapikubov.rf.gd/teparexukutemifedudo.pdf
    • http://petizitopebil.epizy.com/mukisaxeloradububix.pdf
    • https://s3.amazonaws.com/wibedubosateg/amoled_burn_in_fixer_app.pdf
    • http://rowavironipomiz.epizy.com/nebolobimom.pdf
    • https://s3.amazonaws.com/timituvupame/bumufubikukoguxinovobat.pdf
    • https://s3.amazonaws.com/godoremitiwuja/vesuti.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_off0001129b.bin
2a86073f03598b03901231bd3e4861303b23b24826c78be376858e0e48e22129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 5552 bytes
font_01_sfnt_off00012577.bin
d9a42e68b3b65c66236f3822242abae9dddbaddfd4528c0aa13d7fcfc10532ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 11520 bytes

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