Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb6cef4049d78d7…

MALICIOUS

PDF

154.7 KB Created: 2021-02-15 00:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fab2d558424a3a4842238e890d8519da SHA-1: 6ea285f711cafc68ade1baca06278e3ebcb8143f SHA-256: 2eb6cef4049d78d7c1813618ff82cc60632806f15259f5d509b94fbe164e2e79
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, specifically for phishing or malware distribution. The ML classifier and ClamAV detection further support this assessment, flagging the PDF as malicious. The document body's reference to 'Sandy hook victims coroner's report' suggests a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/aws?utm_term=sandy+hook+victims+coroner%2527+s+report PDF link annotation
    • http://juxoxelobonoje.22web.org/xaxusodatebireb.pdfIn PDF document text
    • http://forumapu.iblogger.org/jisexafuvejeku.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/ijh2C01/senujekewegutudi.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/JTPiehf/dungeon_keeper_game_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rofanuw.rf.gd/7th_grade_math_word_problems_with_answers.pdfIn PDF document text
    • http://torexogisodejez.epizy.com/meteo_casinalbo_di_formigine.pdfIn PDF document text
    • http://jorowubibe.epizy.com/school_administration_definition.pdfIn PDF document text
    • http://winenezufu.epizy.com/jejanupoxixudirumiloxi.pdfIn PDF document text
    • http://rigirulame.epizy.com/65181555859.pdfIn PDF document text
    • http://demaketimazo.rf.gd/boboiboy_galactic_heroes_game_apk.pdfIn PDF document text
    • http://pizoxuwa.epizy.com/bach_piano_sheet_music.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/wokezedixovabutifosupa.pdfIn PDF document text
    • http://ketonabewuzove.epizy.com/cumulative_adjectives_worksheet.pdfIn PDF document text
    • http://xefukogan.rf.gd/gidoditer.pdfIn PDF document text
    • http://juvegebufu.epizy.com/driver_brother_2701dw.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/adobe_after_effects_text_animation_presets.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_off0002221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2221B 5644 bytes
SHA-256: 2c51813d2c25e9864230d28983a907d8d532c3cf20e01a6571f3c6216ef6b641
font_01_sfnt_off00023538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23538 11752 bytes
SHA-256: bdcebcdf84db2b79d59b74a1955f28c048b2e48eadf4b6ef678adb96ae087d2a

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