Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdec1bf90f4acafb…

MALICIOUS

PDF

69.5 KB Created: 2021-03-03 22:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5b67c78150698b6401084013effad4e2 SHA-1: 001b0721ef89e17be6fa838436c238b707af25ff SHA-256: cdec1bf90f4acafbd3ba4822cc4227f8d45d511393fda16b7c2b6fc816449cdd
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are flagged as link farms. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to academic exercises, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=ejercicios+de+limites+resueltos+2+bachillerato+ccss PDF link annotation
    • http://prizyivnik.ru/chunariya_lele_aiha_videos3ocd.pdfIn PDF document text
    • https://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/majekowe.pdfIn PDF document text
    • http://timinome.getenjoyment.net/roxewozekagivilad.pdfIn PDF document text
    • http://rewita.fun/what_is_double_remote_proctored_internet_based_testkxmvq.pdfIn PDF document text
    • http://boviriso.22web.org/tesla_model_3_price_lowered.pdfIn PDF document text
    • http://zupiworifokovaw.22web.org/zenodegusugelofanew.pdfIn PDF document text
    • http://axacheat4.xyz/child_development_and_education_6th_edition_usedn6w1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474727/normal_602ee0a7c8c59.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/tobuvuroxoliv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobudesupak.epizy.com/zujajomo.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/tafudusikexivotofaleg.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/who_built_america_documentary.pdfIn PDF document text
    • http://biwomilorawud.rf.gd/texas_instruments_ba_ii_plus_professional_battery_replacement.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/les_miserables_musical_cast_2020.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/perdona_si_te_llamo_amor_2014_youtube_pelicula_completa.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/41814037897.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/barricades_mysterieuses_sheet_music.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_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 5484 bytes
SHA-256: 86f5745608c90fd19875b513bb8ab6cfa26896fb1e1d61f6a4996a9876e98ee1
font_01_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 11712 bytes
SHA-256: 2e0e264940186bb2465acf297cbb7b82d22d00bdba349ca411212d57c89a6445

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