Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84511031974bcdc…

MALICIOUS

PDF

70.2 KB Created: 2021-03-04 23:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 48c918078aeda844ab9ae0575f995682 SHA-1: f4eef4a0afc95f3155e68e0f043fc493c5a6fbdc SHA-256: a84511031974bcdce30091e47cacf713f3072b555f7559fe9c7c92e1df174a03
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured with UTM parameters, suggests a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'Afterglow wireless headset not charging', likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=afterglow+wireless+headset+not+charging PDF link annotation
    • https://kujedoduzenawo.weebly.com/uploads/1/3/0/7/130776750/xorewopesiwedazewuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/jfNZ2if/19442626743.pdfIn PDF document text
    • https://nonegisetuku.weebly.com/uploads/1/3/4/8/134877303/zirolaxemobemupurib.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/jVQw3gS/lefafegujebar.pdfIn PDF document text
    • http://wawovotem.22web.org/gamoluxisukob.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/a8b50de.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/JTgIjav/jesesiwirovus.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/08dc6174416ae.pdfIn PDF document text
    • http://lulelege.iblogger.org/sodapenizoresasez.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/ggichib/68149001338.pdfIn PDF document text
    • http://surisetufuna.iblogger.org/fidizidojutumizesejese.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/xdjf6jc/40768068029.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/hp_4630_printer_not_printing.pdfIn PDF document text
    • http://filitopalanima.22web.org/wofunepilibujelodorid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/blue_ribbon_foods_prices.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/46828250862.pdfIn PDF document text
    • http://sulorunak.rf.gd/68889909343.pdfIn PDF document text
    • http://ravitog.rf.gd/shape_tracing_worksheets_free.pdfIn PDF document text
    • http://xefakasafaze.epizy.com/black_and_decker_cordless_trimmer_not_working.pdfIn PDF document text
    • http://situfixumuvefom.rf.gd/kijalidajaf.pdfIn PDF document text
    • http://lamumabazekutum.epizy.com/87812547690.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_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 5364 bytes
SHA-256: f66207c09135c9422ded3f8f32ebb4865a729ace8b06c0d5ea889e74e38ced32
font_01_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 10328 bytes
SHA-256: ae95d2e43c8bff7b191f3848c72e115c4918af27761922ad5293cda4bedd9ed9

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