Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b3d04df7a3ce45…

MALICIOUS

PDF

81.4 KB Created: 2021-05-01 22:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 684cc7b57184bdb9157abed807363f90 SHA-1: 10a58293f2062825dda83cd28a2edd1d250610f3 SHA-256: 13b3d04df7a3ce456d1434bb09208928dda5f7d359f8195abee208d7637fc53a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates a strong likelihood of phishing or malware distribution.

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://lozipotod.ru/strik?utm_term=iata+dangerous+goods+regulations+pdf+2019 PDF link annotation
    • http://murimubijejaba.mygamesonline.org/42658234485.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/que_es_la_inteligencia_psicologica.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/diesMcs/lexia_reading_core_5_level_11.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/chinese_herbal_medicine_materia_medica.pdfIn PDF document text
    • http://tadolonelo.sportsontheweb.net/lean_muscle_workout_plan_male.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/kujotabovadamajapafizu.pdfIn PDF document text
    • http://numidib.22web.org/65926989565.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/dDiehcD/mogak.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/jemgeDC/marketplace_mall_food_court_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/ketofebem/JTid3br/christian_songs_mp3_audio_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowatu/CqMggD8/rail_rush_battle_set_beyblade.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/systematic_random_sampling.pdfIn PDF document text
    • http://serovakarara.mygamesonline.org/applications_of_mathematics_in_the_world.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/zizuxabuzejuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_d25f9eb5e16b461dab8301c5729f32b4.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_21432b7751f9489e80b52ec49584acce.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_3b6ce95553904d638c7c96a0972897fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/calendar_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/91201025394.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_921c196b285b408592b99be722281a69.pdf?index=trueIn PDF document text
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_ea54babf267648ac9dcd3d892bcde5aa.pdf?index=trueIn PDF document text
    • http://tuwutexo.onlinewebshop.net/xamedojupufufugilofik.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_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 5628 bytes
SHA-256: 7bceb53108c614acb1062800db0abf9590dda6ecf02a238b4c7d46bf616b2a3f
font_01_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 12040 bytes
SHA-256: cbeadaa238e00ac46921cbae6f6c363bf20e33baa8087c82e77ff13afc842d21

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