Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad635933ab136d18…

MALICIOUS

PDF

41.0 KB Created: 2020-06-14 00:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: ee27f780cc269802052f21bad8c5417d SHA-1: 5762f233d247b05ee1c50aee658e6d9b8013d057 SHA-256: ad635933ab136d18cc91c8b9f29d9ac9ddfdbf6eb6d3ceaeef70a35638f79b21
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to PDFs with numeric or generic slugs, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The primary URL identified, 'http://mail.bistro-cafe.gr/uploads/1/3/0/8/130873861/130873861.html#%25C3%25A7izim+dersleri+perspektif', suggests a lure related to drawing lessons, likely to entice clicks to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://mail.bistro-cafe.gr/uploads/1/3/0/8/130873861/130873861.html#%25C3%25A7izim+dersleri+perspektif PDF link annotation
    • http://mx.mrsblakelymath.net/uploads/1/3/1/4/131453194/50020ff52be06.pdfIn PDF document text
    • http://tayanaschildcare.com/uploads/1/3/0/7/130739718/fofila-viwerujasutoti-nusogi-sitemufupigiru.pdfIn PDF document text
    • http://gracewoodinbloom.com/uploads/1/3/1/3/131383475/lusok.pdfIn PDF document text
    • http://hostmaster.trouwautoroden.nl/uploads/1/3/0/6/130639740/vogelajakabifigatebu.pdfIn PDF document text
    • http://tastinggame.eu/uploads/1/3/0/5/130545882/5881797.pdfIn PDF document text
    • http://webmail.beyou-boutique.com/uploads/1/3/0/7/130775174/ee7a9173a9.pdfIn PDF document text
    • http://mazila.co.za/uploads/1/3/0/2/130289443/wopizorevi_lawapafise_jewewum_maride.pdfIn PDF document text
    • http://wright.business-facebook-covid19.com/uploads/1/3/1/4/131438324/1eb94974cce.pdfIn PDF document text
    • http://linderdwyertherapy.com/uploads/1/3/1/8/131871568/saparaja_mufubuteked.pdfIn PDF document text
    • http://gibbsmanagementgroup.com/uploads/1/3/0/5/130589122/guzawewijaremiwugo.pdfIn PDF document text
    • http://the-style-store-online.com/uploads/1/3/0/9/130969542/967cc.pdfIn PDF document text
    • http://disfrutecostarica.com/uploads/1/3/0/7/130738975/riroruf.pdfIn PDF document text
    • http://holiday-lights.net/uploads/1/2/9/0/129092126/129092126.html?whiteIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://juvavapu.files.wordpress.com/2020/06/bopanepaliveme.pdfIn PDF document text
    • https://kaxajesowep.files.wordpress.com/2020/06/39453310030.pdfIn PDF document text
    • https://rewudiref.files.wordpress.com/2020/06/memuruzebitebo.pdfIn PDF document text
    • https://pagasel.files.wordpress.com/2020/06/megupozitodogop.pdfIn PDF document text
    • https://jogutoju.files.wordpress.com/2020/06/zenofobakodazef.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7225 11664 bytes
SHA-256: 30742e6c7d4272c26d0340047d8159dcf6d111901e48c0454d1eea8f0a6e4fa0

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