Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b56a8c1767d938d…

MALICIOUS

PDF

80.9 KB Created: 2021-03-29 05:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 357cf960bee630a29625620c502e8c27 SHA-1: 5b2bd2b9882ad821756b4a46690105640f79bb51 SHA-256: 4b56a8c1767d938d4fba0bde36b524c972832b3aacdfe4035a310d8afb94d78b
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 0.9998

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://ponafet.ru/strik?utm_term=lady+of+the+lake+university+basketball PDF link annotation
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/c90fde8d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_6031f8891686a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_601d08a2534bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5fcb0ef7ef2af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5ffdb8b89ab1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_6060febabc676.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/jajcPxy/barrett_jackson_showroom_2019.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/2132bc10ab9ae.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/Szjhjis/43477441316.pdfIn PDF document text
    • https://xujeloza.weebly.com/uploads/1/3/4/0/134096435/6592615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60509a0b0f08b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_6000f9bce8453.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/gdwhbiu/pubg_mobile_screen_recorder_with_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/ebugggg/hangouts_app_android_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460255/normal_6003aa6825040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_186b1230ce5641ec8359132a8299482e.pdf?index=trueIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_81c3f5a5e6bf422882abe4e67250a2bf.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_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 5300 bytes
SHA-256: e1005f59e35e3ed2a9c6458db8a3fb161a7f49618c7a2af8616a764394ebf5ef
font_01_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 11716 bytes
SHA-256: e11b74abc84fff05c8b8f9185087baa0ecaa7055ad72fc477ca2afd8b271f960

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