Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcdf6f1d80d81cb…

MALICIOUS

PDF

77.8 KB Created: 2021-03-10 01:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a4eefefa1fe890ee9c97fe6468ba94ab SHA-1: b0d2cc5ba31cf36bf2fbc823ce1612edf2e4b335 SHA-256: bbcdf6f1d80d81cbbbfa1c08b91f0b7d0e085dccc90064c39f0b558a3364840f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution tool. It contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, designed to lead users to malicious websites. The primary attack pattern involves using these links to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://dafemum.ru/award?keyword=free+radical+addition+reaction+of+conjugated+dienes+pdf In PDF document text
    • http://vumexovuvelafe.medianewsonline.com/vuxotimobu.pdfIn PDF document text
    • https://lonamoki.weebly.com/uploads/1/3/5/9/135964194/8586072.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/zogajazimebixutowim.pdfIn PDF document text
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/9198003.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/108418.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/xolitajapaw.pdfIn PDF document text
    • http://zaruxejubo.iblogger.org/8153104826.pdfIn PDF document text
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/jaxufirobo.pdfIn PDF document text
    • http://nufurimuler.iblogger.org/35267573750.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/wall_street_journal_subscription_free.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/texenabinuv-dinelo.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/pamupikewujorokenavaxeli.pdfIn PDF document text
    • https://nerutaraludu.weebly.com/uploads/1/3/4/6/134672403/dubodobopumoxabim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27bb591-7a74-48a2-8fc4-2a08261a1c78/facebook_page_live_chat_help.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafa1bbc-1a33-403c-9000-1019a7b0b866/mesefozeduninumisunataj.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/xeferufofa.pdfIn PDF document text
    • http://vobununebufipu.rf.gd/60263334768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6351f2c-8047-4e3b-be7a-c50621f62391/bushel_with_ibex_motifs_animals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3cc586e-cb30-49ff-b423-ce525794ba6d/contrato_de_arrendamiento_sencillo_para_imprimir_ecuador.pdfIn PDF document text
    • http://roxixelojoxas.rf.gd/drawing_graphs_of_quadratic_functions_worksheet.pdfIn PDF document text
    • http://wisezeji.epizy.com/industrial_press_machinerys_handbook_31st_edition.pdfIn PDF document text
    • http://nepopujadulipid.epizy.com/magic_eraser_sheets_publix.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/lightroom_editing_tutorial.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_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 5356 bytes
SHA-256: 0230128e86345bdcac716c52fbba4e6848dc5bfc52ede525738ffb1298446780
font_01_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 10684 bytes
SHA-256: 80f73508cbb956dbe17461432ce42f338a5d8d82e94ef51d8cf12af7c01bfaf9

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