Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3a594b43a7468b…

MALICIOUS

PDF

109.4 KB Created: 2021-03-24 06:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de45666ab5baeeab7ec98fdb0a56a63a SHA-1: 8ebe22c09a51f128d0113a0dcdcb4511995fda19 SHA-256: ac3a594b43a7468b9378644f7a23ed51b6ec8071e360230c41830247d608dad1
154 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by a machine learning classifier as malicious. The document body, though heavily obfuscated, contains references to 'Stephen King's IT release date' and application metadata, suggesting a lure. The presence of numerous URLs, many on disposable hosting, indicates a link farm or phishing attempt. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/strik?utm_term=stephen+king%2527s+it+release+date PDF link annotation
    • http://gadatoreneperil.mygamesonline.org/how_do_i_activate_call_waiting_on_my_panasonic_cordless_phone.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/vuvegurudu_wagufinububabo.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/zetim-zodubewigeg-tevuxenobaviga.pdfIn PDF document text
    • https://cdn.sqhk.co/sufipuxifemo/Temq5zN/giduxus.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/iJhjhh8/world_cup_match_heroes_live_streaming_free.pdfIn PDF document text
    • http://dosijaruwiteli.mywebcommunity.org/rozigaweb.pdfIn PDF document text
    • https://lasezafokovopar.weebly.com/uploads/1/3/5/2/135294620/c2c65b73a.pdfIn PDF document text
    • http://nekretnine.site/226971510293lnj7.pdfIn PDF document text
    • https://vexokefiveve.weebly.com/uploads/1/3/4/4/134494279/neworokovoxet.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/bjcOigi/download_drift_max_world_mod_apk_rexdl.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/76212307533.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/83705742705.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/2hjW1jg/verizon_messages_plus_backup.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/rgdjeuf/52516944655.pdfIn PDF document text
    • http://opsnatur.fun/xagajesisejed0c1m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_ee873f70d43b4b3393e6324df7c2584c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/46098759422.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/ontology_epistemology_and_axiology.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/assamese_bihu_video_songs_free_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/degowibejunato.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_5ace97e87bba483985d4cb6b4299f402.pdf?index=trueIn 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_off00016c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9E 5424 bytes
SHA-256: 746b51fff2a450bcea50ba09e8826d8afe7b3f1a558a8095b041d24735e9ecff
font_01_sfnt_off00017f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F0B 12168 bytes
SHA-256: 225c26f63e06e9e9e7483a7f5f81074de0c4f52362942c3cfac0e2de0d101ba8