Malicious PDF — malware analysis report

Static analysis result for SHA-256 820a0bb973a62946…

MALICIOUS

PDF

112.5 KB Created: 2021-03-23 19:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ecb631fac18f09e89074e57d99c3632 SHA-1: 78eabc90702f8223c88361330627e319dde91945 SHA-256: 820a0bb973a629461c86417470d8221c65eff7c5ecffc19d0e5f997315face50
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate SEO content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates a phishing attempt related to prizes or parcels. The ML classifier and ClamAV detection further support its malicious nature. The primary attack vector appears to be a phishing lure leading to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/award?keyword=agile+software+development+principles+patterns+and+practices+pdf
    • http://sowakowakemim.mygamesonline.org/auditing_and_assurance_services_a_systematic_approach_8th_edition.pdf
    • https://cdn.sqhk.co/somufegojaru/Vjgibja/kelagazozonukebapujeji.pdf
    • https://cdn.sqhk.co/fabunavaxa/b58DgcN/xuzodipijemizuror.pdf
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/lonixu_letebasokeju.pdf
    • http://vetobiz.sportsontheweb.net/59080152715.pdf
    • http://zokugorevat.mywebcommunity.org/waste_management_plan_for_construction_site.pdf
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/kovadokuzekani.pdf
    • http://tevituvodejifep.mywebcommunity.org/agro_ecological_zones_of_bangladesh.pdf
    • https://cdn.sqhk.co/gukisafuw/dfkCjd9/my_talking_angela_games_play_online.pdf
    • https://cdn.sqhk.co/tewokozogop/niNGJhh/ai_dungeon_remember_tips.pdf
    • https://wapetosov.weebly.com/uploads/1/3/4/6/134665674/sutixazesilubos.pdf
    • https://cdn.sqhk.co/futogifoku/NzShhR0/limestone_college_football_camps_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feputuwi.epizy.com/22081574556.pdf
    • http://pikididubemet.epizy.com/zurokusaxafamata.pdf
    • https://s3.amazonaws.com/verirejon/office_for_mac_cracked.pdf
    • https://s3.amazonaws.com/tigewibejageju/salile.pdf
    • https://s3.amazonaws.com/fofeguj/wukomefemiko.pdf
    • https://s3.amazonaws.com/bulikowexunepov/lixoseladopiwetigukow.pdf
    • http://pepebejawu.epizy.com/1093760608.pdf
    • https://s3.amazonaws.com/lotibabakuj/icar_net_full_form.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/bowapiloxoroduvaxom.pdf
    • http://lavuradisaxel.epizy.com/baaghi_film_ringtone_pagalworld.pdf
    • https://s3.amazonaws.com/remuv/how_does_it_make_you_feel_jw.org.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_off000177f3.bin
ceabc7d6c6fe2620eccf75317737d0bedcf4f2c4b4eaeab6ea24af507a23bbff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177F3 5616 bytes
font_01_sfnt_off00018b1c.bin
a8997d3abaace2329a4d2add1ed8142c9444f41aae587d6676072eab349d51d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B1C 13348 bytes

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