Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adba0716f633b4c…

MALICIOUS

PDF

74.7 KB Created: 2021-03-11 15:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 044fac1beaf4c446d0bb7db9900ed3fe SHA-1: 207fc980168fe4338430ec2e4fe225c756339e73 SHA-256: 5adba0716f633b4cdb7022fa685b735f8b537e376e47b977ef9806a28714302a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URLs disguised as vocabulary resources, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous links to potentially disposable hosting and the overall structure point towards a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=describing+physical+appearance+vocabulary+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446170/normal_60085fa4dd82c.pdfIn PDF document text
    • http://hristogrigorov.com/conjugaison_avoir_a_tous_les_tempsovgui.pdfIn PDF document text
    • http://nakozovuzu.22web.org/what_is_an_example_of_an_architect_applying_systems_thinking_principles.pdfIn PDF document text
    • http://wabixekere.iblogger.org/how_many_calories_in_a_large_caramel_craze_latte.pdfIn PDF document text
    • http://nofamuxerewe.22web.org/42768749626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5fede858c080c.pdfIn PDF document text
    • http://reduslim-sitoufficiale.site/fumobuzepuximibafir4ahc0.pdfIn PDF document text
    • http://mandarin-fruit.space/59134522930v4is0.pdfIn PDF document text
    • http://banquepopulaire-fr.org/partes_de_una_revista_escolarprylu.pdfIn PDF document text
    • http://gufutaca5.xyz/active_listening_exercises_for_middle_school_studentsuqkba.pdfIn PDF document text
    • http://xigujawuruwuko.22web.org/the_burning_room.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://popuzavefigud.epizy.com/21385690112.pdfIn PDF document text
    • http://zirugobaxunorix.epizy.com/google_maps_api_key_free_android.pdfIn PDF document text
    • http://rofijig.rf.gd/xeginesigu.pdfIn PDF document text
    • http://gotapomoleza.epizy.com/japan_times_tv_guide.pdfIn PDF document text
    • http://pagitewuzowika.epizy.com/ant_life_game_android_tips.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_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 5716 bytes
SHA-256: 646d6e120170b7daba09b9e8a41773f34b729d637cefa3a7e368272e45636aab
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 10292 bytes
SHA-256: 9f732c83a7669c9a43a6669c65a9a4ac5a6e1c4c213d22862ed6d5b724032338

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