Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4253381ab704dd6…

MALICIOUS

PDF

75.7 KB Created: 2021-03-14 20:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6e6aff10661260b373a94583b374c662 SHA-1: 6fa43b94fefb806524047249b055a4f8f73a4d07 SHA-256: d4253381ab704dd67f00d125d42ff0f448694c6fa5d4e6eb4185d5ecb111bfbf
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 hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book title, aiming to trick users into visiting the malicious URLs.

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://gimoguvi.ru/strik?utm_term=personality+plus+florence+littauer+book+pdf PDF link annotation
    • http://sagedix.medianewsonline.com/what_is_the_best_value_for_money_metal_detector.pdfIn PDF document text
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/jobusa.pdfIn PDF document text
    • http://jopkapopka.online/41672733773qi78g.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/migiv.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/merever.pdfIn PDF document text
    • http://viwoxufegoger.sportsontheweb.net/70392317903.pdfIn PDF document text
    • http://accface.in/completed_d_d_character_sheetdq9t4.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/how_many_carbs_to_eat_on_diabetic_diet.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/hunger_games_file_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasuwunal.myartsonline.com/tipos_de_medios_de_comunicacion_no_masivos_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/66825147592.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/zumomowularomobu.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_c45d7b405eae488189faf970a5cc5284.pdf?index=trueIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/highway_safety_corridor_pennsylvania.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_f8a1e03db8704fe5bfbe5ddfc6d83b48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/elasticsearch_index_template_mapping.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/lilupeke.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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 5456 bytes
SHA-256: 6fd238c5bf66989dcd1680657a2bce58226f483369e426d8ec656c2d5c2f48c2
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 11736 bytes
SHA-256: 98654a6eff418ee4033e69e50e338563f4255df5a600889c67d1f11e80896081

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