Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fe4d28760bef23…

MALICIOUS

PDF

76.5 KB Created: 2021-03-18 18:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 047279cd05d1c07ce9fe4ef68b04175e SHA-1: 4cfde9b03c5b408f28bcae1a322fca4c6f6170f8 SHA-256: a3fe4d28760bef23a17aadea9c70051bbe762cc919e120a4d216b6576f7f6182
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a significant number pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=beggar+thy+neighbor+a+history+of+usury+and+debt+pdf PDF link annotation
    • http://kengoru.space/siluvimete7r5kn.pdfIn PDF document text
    • http://alcexpress1.xyz/how_to_cite_a_database_harvard_stylemea27.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/iso_9001_version_2015_clauses.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/FigUdih/14432764956.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/17551248242.pdfIn PDF document text
    • https://pidolanapeg.weebly.com/uploads/1/3/0/8/130813957/nikusadenonu.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/gFHjjgf/44190283484.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/7ijjgjg/bijadujezoladareguxawemu.pdfIn PDF document text
    • http://thepropheticapp.com/92474129358iybhi.pdfIn PDF document text
    • https://setunifajufin.weebly.com/uploads/1/3/5/9/135989633/fojufelana_vukedofu_gewin_vezawanepibizet.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/rotufakulagetipebevuba.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/jcUUsih/94616930696.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/xevuve-malotanef-vuponelolum.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/vugazotovep.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/9e2949ae656.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/0e86cb014039.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/31004150284.pdfIn PDF document text
    • http://sk-anker.ru/books_similar_to_fifty_shades_of_grey_and_bared_to_youkxugx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wamunezufim.rf.gd/naming_ionic_compounds_worksheet_1_monatomic_ions.pdfIn PDF document text
    • http://ligumawi.epizy.com/fansipan_hiking_guide.pdfIn PDF document text
    • http://tawexega.epizy.com/81285497417.pdfIn PDF document text
    • http://babijegogaluz.epizy.com/simile_metaphor_definition_examples.pdfIn PDF document text
    • http://kigapamoxatiw.epizy.com/collins_connect_answers_maths_3._3.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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 5564 bytes
SHA-256: 056dc7026030f05dbf8da3646e10757464813e97cbb0bc7d40cb513d4de480ba
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 10804 bytes
SHA-256: a5f80de62177c9fb033048329169f116cd9aa54df23e1ba8b25088420365b017

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