Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8363eeb9d115c2…

MALICIOUS

PDF

109.1 KB Created: 2020-11-26 05:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4492997c81796fe742605b022c2f7b7e SHA-1: 4fcb6e0534702a1f63de5ba590790283889b3c85 SHA-256: de8363eeb9d115c24ef50865eafc8844d2037a8dda175fc31dbe236675f79549
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for SEO spam or phishing. The presence of 'Washu college confidential' in the document body, though garbled, combined with the link farm, points towards a lure to entice users to click on potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffe.ru/123?utm_term=washu+college+confidential PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5f8fd4a27552c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f8af5f2ab6b8.pdfIn PDF document text
    • https://wozogerodinanu.weebly.com/uploads/1/3/4/4/134498855/1eb435d0924856.pdfIn PDF document text
    • https://molipose.weebly.com/uploads/1/3/4/6/134644393/e8af2fc7164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_5fae58f553cdf.pdfIn PDF document text
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/34747.pdfIn PDF document text
    • https://rixemeja.weebly.com/uploads/1/3/4/7/134711448/kigosigade_vapunexixe_vevowofobigijep_pafulubozalura.pdfIn PDF document text
    • https://gosopitodemeku.weebly.com/uploads/1/3/4/8/134874694/1841231.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/069e458d6d2.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/rimejiguvif/difference_between_monocot_and_dicot_leaves.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/semevakerifodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11263cb6-c153-4b08-abb3-817a5fe522e2/zutaribidurafonugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e469d13-a184-4f13-9a82-783eddc98873/49043108849.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_off0001712f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712F 5200 bytes
SHA-256: b117796665b3dd7c571c55ce3f8cbb8ee3787e1fd73ee8bd515ccbe766ce38f8
font_01_sfnt_off000182f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F0 10704 bytes
SHA-256: 6092e419bde9eabff5c62117e7c63a7966421ce36d5e0e86f21549d1cd49824c

Open this report in the interactive analyzer, or submit your own file for analysis.