Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c7efdfde88fbb9…

MALICIOUS

PDF

68.7 KB Created: 2020-11-11 07:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c3b99aea474ed6a83f68915de022ac5e SHA-1: 1f99d3757f8c72d98c89b3e01e0bcbcd6e0e8b8f SHA-256: 57c7efdfde88fbb9c29f9b4570d4460f648a4705cb8377b3025ced9fc1b908fd
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://traffset.ru/wb?keyword=free%20movies%20apk%202020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f95900801137.pdfIn PDF document text
    • https://gegakavawedo.weebly.com/uploads/1/3/4/2/134265750/kawevukesujus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5f934492d7df8.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/tisejorezaba.pdfIn PDF document text
    • https://zemovawid.weebly.com/uploads/1/3/4/6/134608463/titonujavif-wiwor-vefenu.pdfIn PDF document text
    • https://bitivomo.weebly.com/uploads/1/3/4/4/134478942/zozalafiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_5fa26aed76668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5f947653a2e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5f9b3c85759a5.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/bajuse/42328619917.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/44028137922.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/nobudufi.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/vadejenujixepuloja.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/chapter_10_assessment_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 4888 bytes
SHA-256: 6b13ec82ee3843b530fe62c6f2223665371664019d9368215732423ce1d5d0ef
font_01_sfnt_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 10028 bytes
SHA-256: c9381ed6b0f563bda42c853725ad576bc7cbcdc3ddf1123846eb6d37fa54bf9c
font_02_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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