Malicious PDF — malware analysis report

Static analysis result for SHA-256 077132b335775ec0…

MALICIOUS

PDF

82.5 KB Created: 2020-11-24 23:34:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 77f67aa876eb6e4f8bc1a3187bef615f SHA-1: 9b318c8458452ba89464b77003a934183ec7bc6f SHA-256: 077132b335775ec0633901ef5317542b51fe798be7abcee72c664482c3ff33ba
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://trafffi.ru/aws?utm_term=afrikaans+movies+full PDF link annotation
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/b8b9ed11d051.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/faadc7f88.pdfIn PDF document text
    • https://fozegujulukov.weebly.com/uploads/1/3/4/4/134459046/1698744.pdfIn PDF document text
    • https://befekibeje.weebly.com/uploads/1/3/4/3/134319248/fuvibiginakaligasab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f970b0879ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_5f97124403e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f8f75112f063.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/tapalopajoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fb36cdd3d24f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wifukedot/burma_tv_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0966340-e9b6-4e59-827c-b9a21c14360d/lapojokapofobuvesogigux.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/35857002861.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/integer_number_line_worksheets_grade_7.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_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 5028 bytes
SHA-256: 1342b38f4431dc7dc98e31dabae7ea2534331e4a283314196f205a058e7aabd8
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 13108 bytes
SHA-256: 4dc4a4c4521c510f3e8b5bb0c57015ad1ad55147cbabfeb33c3ea91e68018f9c

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