Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57535add6acfcc0…

MALICIOUS

PDF

71.6 KB Created: 2021-02-26 18:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e74f69643a30a9226ce662c3e18523b6 SHA-1: 73e2931f6119cd50229c638aa87245a9dff8eb43 SHA-256: b57535add6acfcc0dc466a8ad8e2ff52259860f773c81820f363e62e2e517dfb
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://pelibifir.ru/wix?keyword=classifying+living+things+worksheet+ks2 PDF link annotation
    • http://help-copyrightservice.xyz/how_to_get_redeem_code_for_free_fire_in_phonepew5w1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5fdbe36d87b47.pdfIn PDF document text
    • https://fopunideneluw.weebly.com/uploads/1/3/5/9/135965314/radakud_lutegu_bosivig_zawaridukel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_602b7f6ba3b21.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/memevabirurara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5ffb4c273beac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_6028b90541ab0.pdfIn PDF document text
    • http://copyrightreports.com/kixewedovec2e3l.pdfIn PDF document text
    • https://niladituzisum.weebly.com/uploads/1/3/4/7/134736231/2434048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_601ac627539a4.pdfIn PDF document text
    • http://filemarker.store/1992918735401daz.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/breaking_news_in_hindi_today_india_this_time.pdfIn PDF document text
    • http://lolkek.xyz/64042964539evtdj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_5fe75ba9e7c3c.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/lokubo.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/f34b9e9c49.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
    • 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_off0000cf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5B 5292 bytes
SHA-256: 3f31046adc694d51190fb32a395febd488b63b7d819c30f20ef61f46bea0d0ca
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 9848 bytes
SHA-256: 814678a40b1b5416a67dde4cb6fd345d115f47cf161049fbd5d1b46090f8de45
font_02_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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