Malicious PDF — malware analysis report

Static analysis result for SHA-256 a913e76dfd826faf…

MALICIOUS

PDF

86.6 KB Created: 2021-03-30 22:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3b96d1705932fd890931517e13097b6d SHA-1: 58f9821f5b206ddbb7a8c405b90f1309599ef4a3 SHA-256: a913e76dfd826faf949f573d3367b76cbdb05e7722f0b035fcd20c102b5e366f
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and it contains a significant number of external links, suggesting a link farm or redirection to malicious content. The document body is obfuscated and appears to be a lure related to Metallica guitar tabs, likely to disguise the malicious intent of hosting numerous external PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/award?keyword=metallica+battery+guitar+tab+pdf PDF link annotation
    • http://bobixuposu.22web.org/51642620463.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/ahJiics/8908254812.pdfIn PDF document text
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/podusagonaminug_wufadozu_zanusoputupado.pdfIn PDF document text
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/a2c09f.pdfIn PDF document text
    • http://busivel.xyz/guide_kalista_mua_905dgy.pdfIn PDF document text
    • https://kejuzeke.weebly.com/uploads/1/3/4/4/134456394/9599181.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/tosewupinaxa.pdfIn PDF document text
    • http://runmasten.online/is_morocco_a_visa_free_country_for_nigeria5701m.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/4020000.pdfIn PDF document text
    • https://lenatazuponos.weebly.com/uploads/1/3/4/8/134888684/keluxikinuveji_sefamafajen.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/hljtgdE/94007445882.pdfIn PDF document text
    • http://vazupuvid.iblogger.org/voviwobipebanosafozud.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/dd2e842dd.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/Zqn4hdz/duked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifotuzo.rf.gd/esquema_metodolgico_de_la_investigacion.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/dodezobopumaxujefu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/liquidnet_asia_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/games_gear_club_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/40413430327.pdfIn PDF document text
    • http://gexefojimikig.epizy.com/gupafuvobetizeke.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/jisitoza.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 5392 bytes
SHA-256: ceae80b2f3e37d39741d0182a55ca97de7964ca3e7090c873bb69e77107cdd07
font_01_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 10992 bytes
SHA-256: b27bbb1473c559f37f0dfcec2ec353eefdd433f011f0c8a7d9a0acc2e9265a85

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