Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e62bda33b183557…

MALICIOUS

PDF

71.0 KB Created: 2021-03-17 17:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a8cc3e978428ea73a52d95c359ee2974 SHA-1: 999e9aceb142614a2383dbedfb5823895227542c SHA-256: 4e62bda33b18355738f08b921b3ce392be8e2cc11c7c8118f11f8cf466245be8
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to a PDF download and includes numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=biostatistics+for+the+biological+and+health+sciences+triola+pdf+download PDF link annotation
    • https://cdn.sqhk.co/dasisogi/ijRhihg/vufavonezapetebixutebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393190/normal_5fe128ed252c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_5fe6a72b868d0.pdfIn PDF document text
    • https://wanesibib.weebly.com/uploads/1/3/4/5/134591449/ropuloj.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/hbjchiW/pojagemegujorowemodivazu.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/sunomisaromuxijo.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/haihiiB/adaptive_optics_for_astronomical_telescopes_hardy.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/arte_contemporaneo_pintura.pdfIn PDF document text
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/9797800.pdfIn PDF document text
    • https://nunesevafarub.weebly.com/uploads/1/3/0/8/130874378/xasekokimuju.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/barnett_vortex_youth_compound_bow_specs.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/how_to_cite_a_recipe_in_mla.pdfIn PDF document text
    • https://mogobuzuxoxede.weebly.com/uploads/1/3/0/7/130740257/4506046.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/10th_class_maths_all_formulas.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/what_is_binary_number_system.pdfIn PDF document text
    • http://dikoxikikalonib.scienceontheweb.net/calendrier_ligue_2_2020_et_2020.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/37943151816.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/xYhdQgg/holland_america_cruise_and_fly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_601df9bf17ab6.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/85409510192.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/xbox_live_code_doesnt_work_in_region.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/kotodur/project_schedule_template_online.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/i_know_better_than_you_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/22436960213.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/free_music_s_for_iphone_7_plus.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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 5700 bytes
SHA-256: a45250edcf8ec2f5547210c8737f9e2892170447d5e13b63566aadc083ef4195
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 9560 bytes
SHA-256: fb548ce88d269993b61506b493573c32040f1219ea81871a50950efbecd2236d