Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64371b0ec57313f…

MALICIOUS

PDF

77.5 KB Created: 2021-03-13 15:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea80f554fda17e7fef0b022dca9e3685 SHA-1: b5d9ba47480a748790e27d8a47f71fd9c899b111 SHA-256: c64371b0ec57313f8a3bc5f4d9509b0c5d335a8e3bf0d86a7372538c5af072aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure for downloading PDF files.

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/award?keyword=famous+biography+books+free+download+pdf PDF link annotation
    • https://cdn.sqhk.co/kefekawit/iijfybt/chores_in_this_house_cat_video.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/wgeGtif/wivoxunafojazad.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/kenenona.pdfIn PDF document text
    • http://piwegowukatugib.22web.org/aiou_b._ed_date_sheet_autumn_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/cvgN9hq/dominations_calling_wow.pdfIn PDF document text
    • https://cdn.sqhk.co/mopijiluxu/jjif1Kp/ps_monthly_games_december_2020.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/how_to_renew_my_illinois_drivers_license_during_covid_19.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/ifiiie2/mlb_playoffs_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_c06d669aec9843fdab31ea426bfff229.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_a84b304ff69b4e81a6301f71ac67e20e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3875004e-f84c-4b21-ac93-db696d5dfb94/34114517509.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_cb83481e90a94fc2a8d01e1dffc164d6.pdf?index=trueIn PDF document text
    • http://lezenexujurab.epizy.com/4th_grade_electricity_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f0adcf-7aff-4c48-9929-3109cd115a92/tixuxudunibozemesofabig.pdfIn PDF document text
    • http://bupazutorudazeb.epizy.com/what_is_pain_management_in_nursing.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_840e4a4886ce41548ee6e464e883ce5e.pdf?index=trueIn PDF document text
    • http://kizufalugomux.atwebpages.com/52241348827.pdfIn PDF document text
    • http://jegowijuvu.epizy.com/office_assistant_interview_questions.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_90ac0c2d5cec40a4b2630caeaacc1ad3.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_4c4d4881f39946d29adc271878adc27f.pdf?index=trueIn PDF document text
    • http://bitenozof.atwebpages.com/how_to_put_water_in_magic_chef_ice_maker.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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 5808 bytes
SHA-256: 1ad87769850401d794af5210633d2c27150fcd189fc4e6776998f8c409966721
font_01_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 11460 bytes
SHA-256: ac777e37be2c0b12e2fa36559ded103701491e3fc28401f7c4707963407b88b5

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