Malicious PDF — malware analysis report

Static analysis result for SHA-256 419dc0ea6f2fa088…

MALICIOUS

PDF

75.2 KB Created: 2021-02-25 09:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f151fbcab50b3a0c7e97e4143240149 SHA-1: 80cbefda0d4c67d2f4761cc4e5543e141d86cd67 SHA-256: 419dc0ea6f2fa088277600b55e1f3d98a482b50d8f86d4e30eea7200dc3117db
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=chicken+soup+for+the+teenage+soul+author PDF link annotation
    • http://fanisore.sportsontheweb.net/fundamentals_of_engineering_exam_study_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/rAjfniL/vafukilixigobig.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/OibRije/r_type_2_rom.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/what_is_the_opposite_of_inverse.pdfIn PDF document text
    • http://sesopuligu.iblogger.org/black_background_image_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/iif2jey/home_design_3d_full_version_free_download_apk.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/what_size_tires_does_a_2012_hyundai_sonata_have.pdfIn PDF document text
    • http://gumelup.iblogger.org/65338840588.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/jdihXOW/73868390276.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/32596940560.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/fusidejebi/adobe_after_effects_title_projects_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/handwriting_practice_worksheets_for_6th_grade.pdfIn PDF document text
    • http://kutezowifemiwe.epizy.com/god_is_dead_song.pdfIn PDF document text
    • http://besosive.epizy.com/wilton_decorating_tips_guide.pdfIn PDF document text
    • http://tutapivemaki.rf.gd/lagoxon.pdfIn PDF document text
    • http://gateguka.epizy.com/medical_tourism_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/vikabunoxenufawezidabaja.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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 5244 bytes
SHA-256: 48d84ebea0eb6a74a85113bde2386f5fe64d4f20a6e6627fe1847438c9504ed5
font_01_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 11168 bytes
SHA-256: 3133e808a69c970f51a690c03959d6d6a05889d73b0de76abb896d3a1e405d2d

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