Malicious PDF — malware analysis report

Static analysis result for SHA-256 545e94386d8e436b…

MALICIOUS

PDF

75.7 KB Created: 2021-03-05 21:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8c25e85ef525d05396ef5146f7c5ed9e SHA-1: fa303d1f9b8b15fed1ef4d4ed94b158e963d3e1e SHA-256: 545e94386d8e436b81fb8f9d9ca772a96d7a7921e0fca156b79a75f7d77813c8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a redirector for search terms related to a video game. This suggests a phishing or malware distribution attempt, leveraging a seemingly innocuous document to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/strik?utm_term=super+mario+sunshine+on+switch+lite PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5ff1b848bbb4b.pdfIn PDF document text
    • http://3gusevshop.website/candy_candy_final_story_espaolccmuo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409628/normal_5ff98864bd075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_6010d353ac2ff.pdfIn PDF document text
    • http://legiontry.online/will_stock_market_open_tomorrowa7y9z.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/sony_hdr-cx240e_memory_card.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_6027d3629043d.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/abb62375b1.pdfIn PDF document text
    • http://wowevopopof.22web.org/html_css_footer_template_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382420/normal_5ff2c383e34e3.pdfIn PDF document text
    • https://detabusikiz.weebly.com/uploads/1/3/6/0/136022277/80d83110683b.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/mukinejemoxawaf.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/haier_mini_refrigerator_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ab1724-110b-4022-a197-a1dc3bef5812/quotes_about_john_proctor_and_abigails_affair.pdfIn PDF document text
    • http://nerelikeg.epizy.com/xomotit.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/turifigetobobesotesupitin.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/bulk_sms_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc9c4d5-9a2f-44ec-a1ec-c4ed67123803/42127827299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a21db73-2d9b-4fe9-b3fa-ad6af6037b6b/how_to_install_honeywell_wifi_thermostat_rth6580wf.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_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 5368 bytes
SHA-256: 40df32407b47d2885e0e19b3e02e5b8e0676b2cc3f2a7da06813733033539550
font_01_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10536 bytes
SHA-256: db05b1b08ac2f973b2eeae4a3472d5ac1b0fe13cea60b41b9ae18d609f43ecf4

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