Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4bbbb51b9870c4…

MALICIOUS

PDF

74.4 KB Created: 2021-01-18 17:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d8a10954f3314645f7e1044c48d8663d SHA-1: 24a3fe81e069f008bc156ae8d37b90a08ce17f3d SHA-256: 3c4bbbb51b9870c481a8d237b4e6255236c6013667b8b808b0acfdbe35067a3e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to reference a school schedule, likely serving as a lure to encourage users to click on the embedded malicious URLs.

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 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.
  • 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://traffset.ru/123?utm_term=lee+county+school+schedule+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f870e7d8adaf.pdfIn PDF document text
    • https://fejajeger.weebly.com/uploads/1/3/4/6/134614243/kabulegitejakin.pdfIn PDF document text
    • https://rutukesusejam.weebly.com/uploads/1/3/4/4/134464581/903984.pdfIn PDF document text
    • https://reratuzofi.weebly.com/uploads/1/3/5/3/135346135/lelepojumatanow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f8c6ecf8d96e.pdfIn PDF document text
    • https://pexesalakodosok.weebly.com/uploads/1/3/4/6/134650812/bedirivinifotif_galuroluxuzulef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408335/normal_5ff3c32a3be7b.pdfIn PDF document text
    • http://mukumalatixuji.iblogger.org/android_blur_background_behind_dialog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokolul.epizy.com/bisubifujafedinik.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/66130639349.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/visual_basic_date_format_conversion.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/prognosis_dermatitis_atopik.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/99419043244.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/15992670411.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/36930851580.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/dog_ears_headband_template.pdfIn PDF document text
    • http://wepuwuzuvam.epizy.com/answering_a_question_with_the_same_question.pdfIn PDF document text
    • http://velefejaforafe.rf.gd/vasugiwugil.pdfIn PDF document text
    • http://xediguvodolej.epizy.com/media_nutrient_agar_adalah.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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5088 bytes
SHA-256: 56c5369bf1bd9410311461a62fd0df79083449dd602aea5869212c8a520d37ec
font_01_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 9828 bytes
SHA-256: 8fe5ec3b3007517258222a8dc6a5317f465f505f27256eea102d2e48d06452e3

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