Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24e79b832bd4dc5…

MALICIOUS

PDF

61.3 KB Created: 2021-02-19 01:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: db900d4b87c13388903eb28c13607560 SHA-1: 28091a472b723fe76a7db4ede373be47d67ed0ff SHA-256: a24e79b832bd4dc560daf74ba7919e8ff9a24911d3969ca9861f2653aa6ac775
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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=how+to+turn+on+ihome+headphones PDF link annotation
    • http://renijulemigato.iblogger.org/logitech_harmony_880_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5fdc5d7aebab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60217a357221d.pdfIn PDF document text
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/5c9c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_5fd8fd6b26571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5ff7f02a7d396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_5fdb0fd42af66.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/piwugomigupakinez.pdfIn PDF document text
    • https://bixoriwapavam.weebly.com/uploads/1/3/4/7/134731951/zanule.pdfIn PDF document text
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/a718a3da7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60158fc19fd16.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/5393215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495391/normal_6006813b5c161.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/savukojubusum/86577548479.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/florida_conservative_voter_guide_2018_amendments.pdfIn PDF document text
    • http://nepupiborama.rf.gd/gevubatoteratiraduso.pdfIn PDF document text
    • http://palomidifigur.epizy.com/southwest_airlines_carry_on_luggage_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/bogivolu.pdfIn PDF document text
    • http://kamabutexukawiv.rf.gd/defective_detective_worksheet_answers.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_off0000b6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F3 5220 bytes
SHA-256: d3349a832361d22b9a233e2ba2f51db5d2d8316173ffe0f1e20aad34a1099617
font_01_sfnt_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 9324 bytes
SHA-256: 6376894a4cf80ec8379c2fec0490b183b9842c81f8d37e0bd379971fba1a6706

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