Malicious PDF — malware analysis report

Static analysis result for SHA-256 91583b6dd2ba8d4e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 03:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4d7fab00ee78757cfa24bf68222b575b SHA-1: 3b487c8f1d7803d1079d196df907c487146b52bf SHA-256: 91583b6dd2ba8d4e7b847233aeffa7cc2e0e38b78714246a16fbdcfbdbbf462d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a potential lure pointing to 'resalured.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/123?utm_term=maokai+top+lane+guide PDF link annotation
    • https://cdn.sqhk.co/wenegifuteg/bR6uibd/13274439526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_603aae97b19ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_603aa748468e6.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/mogijumigevezutavebido.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/8880804.pdfIn PDF document text
    • https://rikumuxazomibib.weebly.com/uploads/1/3/6/0/136082685/744834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_60182ed4e4706.pdfIn PDF document text
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/tumosela.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/to_train_up_a_child_controversy.pdfIn PDF document text
    • https://begobaxu.weebly.com/uploads/1/3/5/3/135336669/145720f43ff.pdfIn PDF document text
    • http://gopilorujisuse.iblogger.org/16994619871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462708/normal_603d71dd5a273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_604354e895bc3.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/medical_surgical_nursing_1_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/8OgfhdP/37375806724.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/brgiKja/gasax.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/fijgigi/vizedaburujukapo.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/iePkPhi/emojination_2_losung_level_19.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/jinotugiwomo/how_to_connect_my_blueparrott_headset_to_my_phone.pdfIn PDF document text
    • http://pilojoduzige.epizy.com/business_english_conversation_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/hands_down_best_dad_template.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/funza_lushaka_bursary_application_form_for_2020.pdfIn PDF document text
    • http://rebobimakefeli.epizy.com/77129433912.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/netbeans_java_oracle.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/multiplication_worksheets_ks1_printable.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/o_level_mathematics_past_papers.pdfIn PDF document text
    • http://pujumek.myartsonline.com/52179018385.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_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 4924 bytes
SHA-256: b5052cdbb05adcf7e8090a7f6bdd81ad73131087a5f22ff2057753b23116c60e
font_01_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 11008 bytes
SHA-256: 4f8aeb76ccb0ac0495105820b44359b50bd75f23daca3e72f27b6cf4bd8539df