Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf50147205c5620…

MALICIOUS

PDF

66.2 KB Created: 2020-12-02 06:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 27c3201043fdc324d0ffb7146840ee01 SHA-1: 90995181c6e94fc19b4bc2d78811a63568e96c38 SHA-256: 4bf50147205c562065dd0ea6c0e9e75f1d326ab1c46e0e75ad224cb97c9252d2
156 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 0.9998

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://traffking.ru/strik?utm_term=what+is+a+corequisite+uoft PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419832/normal_5f97b3212a387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_5faeb43f8c4c5.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/9390068.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/walimozozotilupori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f9db5cdddad5.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/183c9fcbfa3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459027/normal_5fb2b10666172.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/zetare/folafuxosokanonupuvizedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7905809a-44fc-4e04-9ec3-04fc3cfed2b0/35379308784.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/domorona.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/minowagevatis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbfb0c23-08f7-4641-8dfc-903a3a79e6fa/12343620584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc3bdad-e18e-43fa-b861-87dbfcc4f187/63302520100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8039ba8b-83c5-48c1-ac02-4b82fe4d5639/mrs_mcmurray_age.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 5076 bytes
SHA-256: f7d918644f748a69c13e2b2324ef031687b8d19be1ad4dfa7a1052638aef6a4e
font_01_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 9768 bytes
SHA-256: 7930fa92580e8c8031a7ce5635b053b9f479c836ca10621d1cf6c87ca9f0c1f9

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