Malicious PDF — malware analysis report

Static analysis result for SHA-256 587db977bb1ba913…

MALICIOUS

PDF

87.8 KB Created: 2021-02-23 23:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c2a4d0998a4c3a5190a6539451dc2b84 SHA-1: 104e1ec27f23e5825a003ac8f82fb4d0b78224ea SHA-256: 587db977bb1ba913fbfaf10599f47aabc701b270e9644c8b5bf99fe8a61aac56
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://baarspo.ru/strik?utm_term=star+trek+voyager+season+4+episode+23 PDF link annotation
    • https://gajokazatiduker.weebly.com/uploads/1/3/4/3/134320060/f4fad199eac.pdfIn PDF document text
    • http://patolul.iblogger.org/the_cars_drive_sheet_music.pdfIn PDF document text
    • http://mutinujevax.22web.org/android_10_custom_rom_for_oneplus_3t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fcfe5820b619.pdfIn PDF document text
    • https://waboralitenir.weebly.com/uploads/1/3/4/5/134504299/9013f6.pdfIn PDF document text
    • http://lufatomitonad.22web.org/9723989097.pdfIn PDF document text
    • https://xipurewaxo.weebly.com/uploads/1/3/4/7/134759043/peremizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5fd779dbd87b2.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/0b9f2ef3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5fc6898f45b44.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/0f710fa3a8c875.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/podekuvapoxibu.pdfIn PDF document text
    • https://lifigosup.weebly.com/uploads/1/3/4/8/134884960/sipinig.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/wixoduneroxili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nitovotiroxe.epizy.com/9028853255.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 5808 bytes
SHA-256: 8e8d343876cc72be5095bbad0e4aa335a0c9c30b74aafa5dac0850fa7df7734a
font_01_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 11184 bytes
SHA-256: d6f2eebf32eff3f89ab66be3ca4c7480c628983786a264fd40d1760e9ecd3673

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