Malicious PDF — malware analysis report

Static analysis result for SHA-256 143cb0b0ca4c4f2b…

MALICIOUS

PDF

77.9 KB Created: 2021-05-18 19:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1e281351d1da4ea09e0e6d655f9996ca SHA-1: 25e0fd08d857756cef6505d1087692b59b220c15 SHA-256: 143cb0b0ca4c4f2be2f3c36a18073b507b210a9184f472944771c5a0db3d9017
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, indicating a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://yafferge.ru/strik?utm_term=commonlit+romeo+and+juliet+answer+key+quizlet In PDF document text
    • http://gigewaxupupixe.22web.org/begusedasoba.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/9900084.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/9779651.pdfIn PDF document text
    • http://sifulodidikit.22web.org/24725932793.pdfIn PDF document text
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/3052485.pdfIn PDF document text
    • https://poxuweke.weebly.com/uploads/1/3/1/6/131606533/padirojiveje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/93552264264.pdfIn PDF document text
    • http://digupekab.rf.gd/inflammatory_bowel_disease_review_article.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/pegaxovu.pdfIn PDF document text
    • http://tudaxagobex.rf.gd/36041107298.pdfIn PDF document text
    • http://legekiwogitevil.epizy.com/74668711331.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/adobe_premiere_video_intro_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34fba1c5-70a4-44f1-8715-766ba01903bb/mevopedibufetileripuvek.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/73036837161.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/zixevuzovozifinopanafupo.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/android_pay_apkmirror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3bf59e-f7ae-4b6c-8f40-6c6287bece58/kayla_itsines_bikini_body_guide_free_download.pdfIn PDF document text
    • http://remigesej.epizy.com/gcse_physics_ocr_equation_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb5fc1a-cec9-4e24-a47f-26b8ec848f9b/sonic_chili_cheese_fries_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/ativador_office_2010_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/beleef_de_lente_app_android.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_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 5384 bytes
SHA-256: 58a254729ebffc62cde890c0df2b472fd7a31d2b728ee4474aa910acaea3116c
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 10488 bytes
SHA-256: dd42adbea9018ed83d0a2f2e05219aae5bc013a3c1dd0af78e66a63810682855

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