Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1685e371f53ac6…

MALICIOUS

PDF

67.2 KB Created: 2020-12-14 01:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 88fd0b67ac5df510d1464b01bc9f24a6 SHA-1: 4c07f65e6f9e39bcff006ebf202f1dd953e7f8f9 SHA-256: 4f1685e371f53ac62a709b15461970f29156c7cb1e4632b1a8cb44d17490e078
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs, one of which, 'https://trafficel.ru/aws?utm_term=ionic+bonding+worksheet+answer+key+chemistry+if8766', is flagged as malicious. Heuristics indicate the PDF is a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/aws?utm_term=ionic+bonding+worksheet+answer+key+chemistry+if8766 PDF link annotation
    • https://lowisaxov.weebly.com/uploads/1/3/4/3/134361609/3443071.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/giduvosi_zuxafeluzemexu_mupabefedad.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/1748155.pdfIn PDF document text
    • https://mulevemi.weebly.com/uploads/1/3/4/7/134754511/divulevepirel-gewupoposu-ruzoxabi-kixejinov.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/jetede.pdfIn PDF document text
    • https://wepebagelokej.weebly.com/uploads/1/3/4/5/134583559/6479935.pdfIn PDF document text
    • https://gososeru.weebly.com/uploads/1/3/4/5/134597059/8610021.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/gowebabuxogiro/application_for_schengen_visa_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a3bfac-1c9b-40ad-a6e3-2d61677e885f/bivagonotikolizebepapux.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b1b8239b07229151fec3/t/5fce9c9bd1cb7e4e91a35d46/1607376027746/muvapagakel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cbc131-6716-45ca-9163-3b1e45823d63/lozejukuzexazulegom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f189ee0f32b874b4e1c/1606377240893/28711943378.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f284f98375720d7e786/1606377257519/lamodekotuzewukilifatif.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4958e18c5c478ef1eb6d/1606371672943/que_es_una_tesis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc67ab56b97992eb581d6b2/t/5fcd0498d235d37878c9598d/1607271577600/58632041766.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_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 6168 bytes
SHA-256: e2b4ee4b044e2f866daf4929d023daa918541dc364dc17bc1eab24fc319b150f
font_01_sfnt_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 10156 bytes
SHA-256: 69242d647ddcd5e7dc190168a77f00cea97a5a9ba51a9ac90996582924404c99

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