Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21732c253e4df5c…

MALICIOUS

PDF

64.9 KB Created: 2020-11-28 10:59:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d8a0c6d4bc34a8d76e51fcdd81925172 SHA-1: bbb1fef8c703d170ef8b05b6fc797a90868997b9 SHA-256: c21732c253e4df5cd6abdd778a19c830709a665308e8a45ab09e668f7a25ab99
244 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 0.9998

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
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=comic+stars+fighting+3.4+unblocked In PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/cd8f250deb4df1b.pdfIn PDF document text
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/9432839.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/zumenaxaja-jivaj-giluvatuju-kimuti.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/vaputuxijarika_jabinumelu.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdfIn PDF document text
    • https://tosisevutozu.weebly.com/uploads/1/3/4/3/134328017/leripegejowiso.pdfIn PDF document text
    • https://dafuzimobolu.weebly.com/uploads/1/3/4/4/134498283/konawusuxikol.pdfIn PDF document text
    • https://jedufopev.weebly.com/uploads/1/3/4/4/134490540/671279.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/2681029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_5fb9e5e440ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5fb00c652e400.pdfIn PDF document text
    • https://sonujesenusa.weebly.com/uploads/1/3/4/3/134344018/josupupenoseta.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://uploads.strikinglycdn.com/files/679ad21e-55f4-4080-99b7-97be885826d1/our_perception_of_the_environment_is_incomplete_because.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_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 5828 bytes
SHA-256: 457a3ee65164b0fe66cab8f88f101baeafd70247cf7e11cd0d3dd37272d8ad71
font_01_sfnt_off0000c38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 10972 bytes
SHA-256: 2949a895c4405d5cf57bcad85d3cb1a4161e7f0c16ce2cbb77f970e25fa96cda
font_02_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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