Malicious PDF — malware analysis report

Static analysis result for SHA-256 f501360b5b8ae23e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-16 16:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 37f3461bfa6ccaf2d9d36688d3304940 SHA-1: 511d388b30ba1f8f59bbe1bd66131cf4f853147b SHA-256: f501360b5b8ae23ef54c8875db723e25e02eff78ee3d5dc95db2ec40d7a774c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=elderly+abuse+reporting+in+texas PDF link annotation
    • https://sajaxelofokaxus.weebly.com/uploads/1/3/0/7/130776185/keligegax.pdfIn PDF document text
    • http://alkim.xyz/acca_student_jobs_in_uk6po7l.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/b1a135b.pdfIn PDF document text
    • http://kpupnov.pro/99010329938i1mbs.pdfIn PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/4705957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_600d412e612f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_602896d8c260f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fcac403146a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_604348a6b13e8.pdfIn PDF document text
    • http://ighelpcenter.xyz/joomla_4._0_free_templates3brua.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_601e355e9e5fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_6014ef39e3ad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386366/normal_5fff0ea73f843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_602623782b254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_2f9429e0ae1743869c758e49dac017b2.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_50529bd57c8a474fba1424cc1176a9e1.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_bf51efae54f74a328a559bc74332ccf8.pdf?index=trueIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_f725793606fa4abcbd34b9ebbcdf7d7a.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_9761524022eb4f2dbc7238a2520ac792.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_7065a1b75f0d43f89c85126ee1472f7a.pdf?index=trueIn 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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 5396 bytes
SHA-256: bd619ab73aa504e857517ab4753e6440237716b3e0fd18e77f7cf14c4338d850
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 11084 bytes
SHA-256: cdf272591fd784838349147209e2a3246afa35e7b2e5d3abd1848f1acbf6e8ed

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