Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3ac2e47abe6cd8…

MALICIOUS

PDF

52.6 KB Created: 2021-04-19 13:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf948478909dc68be4cbee8691ec2e34 SHA-1: 73425c8c7394a0c326005154263a952bc6e0704d SHA-256: 6e3ac2e47abe6cd812501eec2c8f03d67c3f7be46f2e88e29a46abb35873e50e
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file is identified as malicious by ClamAV and an ML classifier, and it contains numerous links to external websites, including a known malicious redirector. The document's structure suggests it is an image-based lure designed to trick users into clicking on these links, which likely lead to further malicious content or phishing pages. No scripts were extracted, but the presence of multiple external links and the overall shape of the document strongly indicate a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 52 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://yafferge.ru/strik?utm_term=lantern+fly+facts
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/5f5f3ab76a7f3db.pdf
    • https://cdn.sqhk.co/jifedibodo/ZZ5chbM/88094440556.pdf
    • http://mutujejeturuduf.medianewsonline.com/descargar_comentario_biblico_de_william_macdonald_gratis_en.pdf
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/9e14f8793f.pdf
    • http://xabudumame.mypressonline.com/vapomesemunatunumef.pdf
    • http://fikakutipid.mygamesonline.org/multilingualism_advantages.pdf
    • http://venolilixe.mygamesonline.org/bacon_s_essays_download.pdf
    • https://moluxoket.weebly.com/uploads/1/3/2/6/132682852/d39ae33c.pdf
    • http://rivafigikiwax.medianewsonline.com/binary_trees_in_data_structure.pdf
    • https://cdn.sqhk.co/kovezozeseg/bwhaChf/vuravumonobadamowezu.pdf
    • http://rubolanir.mypressonline.com/siwokawitututirapir.pdf
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/9099109.pdf
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/mevopesaw.pdf
    • http://goladelexugezi.sportsontheweb.net/cable_ladder_accessories.pdf
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/2296290.pdf
    • https://kijaxupujik.weebly.com/uploads/1/3/2/6/132695195/dabozoxifofidad.pdf
    • http://xunudijumo.myartsonline.com/98054209691.pdf
    • http://givetupazowo.onlinewebshop.net/ap_biology_textbook_campbell_11th_edition_free.pdf

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