Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f46bdeabaaecff…

MALICIOUS

PDF

69.8 KB Created: 2020-11-16 22:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a9fbdf6bf0bbeb70a40de069851016c3 SHA-1: 2b59d9403b9fdbb9842fcbd74d4e2cfc4a42e9e6 SHA-256: 33f46bdeabaaecffce9f361030b208ab958b57c56b3bfe4a1b40bd18eef82d35
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=interstellar+movie+worksheet+quizlet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f90f26d49c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5f9be68b3a737.pdfIn PDF document text
    • https://wipiduwofudozi.weebly.com/uploads/1/3/4/5/134588456/5607d9108a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5f9661a5d44b0.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/9486422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8be41723e66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/norozovijalu/bottleneck_theory_of_attention.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67dca01-eeb8-4126-bab2-8d0421111e73/american_government_simulation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a014e5b-112e-4901-82d7-55e840aa82c7/yamaha_v_star_1100_classic_exhaust.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/lisp_for_autocad_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/auditorium_lighting_design.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/srimad_bhagavatam_telugu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 5136 bytes
SHA-256: b388f6666f93e0cce570f3321d11332488c55e4456a00dd4625475e859ca6c83
font_01_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10116 bytes
SHA-256: b6ca6d9c593a9abf42d8e0b17dcdb769cdec135d2d2e98c5feb6ca424dd4ef04
font_02_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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