Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e80d4fdb24bc3b…

MALICIOUS

PDF

70.7 KB Created: 2020-11-16 22:56:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b7f3d7a165436b7d463b6994fca131c9 SHA-1: 189b77f64f36870d163e6301958eae3816f9ca30 SHA-256: 40e80d4fdb24bc3b0620eca41ccf404513feed868b9c5046ea6e4da38c2bcf02
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirector document. It contains a large number of embedded URLs, many of which point to disposable hosting or known redirector infrastructure, suggesting an attempt to lead users to malicious sites. The primary attack pattern observed is the use of a link farm to distribute traffic and potentially obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffmen.ru/strik?utm_term=test+vak+pdf In PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/navuzimebajapaporavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_5fa5af4331e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f8ce36fe45ed.pdfIn PDF document text
    • https://koterevimudo.weebly.com/uploads/1/3/4/3/134342185/rorisimogewume.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/ruxepomomoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_5fa2dc01eeb05.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/2598732.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/275bea3e.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/metojolito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f89955de18d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f87133fb58b2.pdfIn PDF document text
    • https://lafikekil.weebly.com/uploads/1/3/4/3/134316660/4956263.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/5281532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b22b6c5-0be9-4050-98f5-d00649c12dd3/kilugasoxixidinaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92368b84-e3a9-4444-829c-821f9af7bca9/vogue_73_questions_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93548d5-8a00-4eb5-9e6c-9208a2440785/xubate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd00d88-5062-41ec-8d42-c240f035a1d1/17884945964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0a4d53-43fa-4cc6-a923-4303050aedf7/best_nature_for_snorlax.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 4980 bytes
SHA-256: 8d0c7079708098db4ccd1f7da2f11eca7c3f52df33d44a1e31b9194bdb0175cb
font_01_sfnt_off0000ccda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDA 10420 bytes
SHA-256: d243ac08b0adc4c6e7a30dd410273b9de66960482f8494a142a2157c158a9f3d
font_02_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 10328 bytes
SHA-256: 1ee9ba4baed2b3bceca98f15f1c32a011fc80cf2260ad9647e0ae667741a7f5a