Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abc997e8950effd…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 07:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 319906ffb379730b82c200542df5d714 SHA-1: 546fc6e786d06fe7c63b5be72de8eec5e1fe0ba6 SHA-256: 4abc997e8950effdcd3a4d2695ddd459dd23eb8d47afff65651b6180313d1c97
66 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 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 0.9994

Heuristics 4

  • 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/award?keyword=unix+basic+commands+with+examples+for+beginners+pdf PDF link annotation
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/lutisegaj-xekerosedod-verojalodolome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_6015c03ed5ed2.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/nazafaro.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/xawunidafem-dexum-lixuja-favefetavibizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_60539b0486366.pdfIn PDF document text
    • http://tryplafond.xyz/how_to_sign_up_for_obamacare_in_missouridcrfh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_60156c2843a2f.pdfIn PDF document text
    • https://kutinimi.weebly.com/uploads/1/3/4/6/134608846/gerigikikirim_siwalofi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5ff5bc1c15ff0.pdfIn PDF document text
    • http://myfavoritesun.xyz/88263651498orl74.pdfIn PDF document text
    • http://kersita.fun/femadesaa07.pdfIn PDF document text
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/7549006.pdfIn PDF document text
    • http://icily.xyz/introduction_to_modern_cryptography_2nd_edition_download_free2g8of.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/wefemabeni/xapubozanafimanexenofuti.pdfIn PDF document text
    • http://mabagojovas.epizy.com/yamaha_r6_service_manual_2019.pdfIn PDF document text
    • http://gabamad.epizy.com/jigomu.pdfIn PDF document text
    • http://pemojam.rf.gd/2388673773.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/471705008.pdfIn PDF document text
    • http://gumubagigafaj.rf.gd/15676564445.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/la_prima_pagina_della_gazzetta_dello_sport_il_giornalone.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/wozowedabojesun.pdfIn PDF document text
    • http://masidurexo.rf.gd/misivabexiwurivovefazex.pdfIn PDF document text
    • http://bedigetulo.epizy.com/gexij.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_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 5860 bytes
SHA-256: da41b2c951a535a158eb7a716b424d730d505f380f96def4916b2bc1397faf76
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 10932 bytes
SHA-256: eecdc5cc9dc870fdf85a48f52e6460f8eab22e3629a0de783582fe83fba7cbfc

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