Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88ee62c7af09b96…

MALICIOUS

PDF

102.8 KB Created: 2021-03-01 09:22:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7297b2d7e07fc4381a7c9eca0398587 SHA-1: 6b9ba7c4a986a7e97583d7a041f23bfeea9d946e SHA-256: b88ee62c7af09b96e26f2444eadfc47085bf14452eca8b6cc8439769c8fbb3ac
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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://resalured.ru/wix?keyword=molar+mass+of+benzoic+acid PDF link annotation
    • http://dogalijun.scienceontheweb.net/the_boy_in_the_striped_pajamas_book_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/aWidh3A/download_game_robot_crash_fight_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/1hehjhb/19506345572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_603b18824dbad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_6027f72e8d649.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/asjfCh7/90s_music_oldies_radio.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/the_leftovers_book_series.pdfIn PDF document text
    • http://kawolamekepe.22web.org/knn_machine_learning_python_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://balazetesu.epizy.com/converter_exo_to_mp4_android.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/cancion_catolica_saber_que_vendras.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/70404402955.pdfIn PDF document text
    • http://makidibe.epizy.com/extruded_polystyrene_sheets_uk.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/digewitev.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 6492 bytes
SHA-256: e372b72275a5be51254aef29237819e264f8666627f7fcebc053501b44a96939
font_01_sfnt_off00014b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B21 5364 bytes
SHA-256: 33c145bc40b0ff274dc62e195153f43d260be0cd6dc0e50239866dba45de8e38
font_02_sfnt_off00015d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D59 15244 bytes
SHA-256: 468eaaf33a30247232672282304588fc3ea67d1809496ce3c0f3f541ba46cb29

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