Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80efafb7ffe2df3…

MALICIOUS

PDF

71.7 KB Created: 2021-03-11 12:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aae9336b0d93908c2dd10016cc865e7d SHA-1: b6ec892f4eaaef1640fda6afc6dbee0c968cb7e3 SHA-256: f80efafb7ffe2df3b8f94b9d350a3ced219ddc5e6827c09244f3901ee7706df7
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=xylem+guide+rail+brackets PDF link annotation
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/nokuwukozarib.pdfIn PDF document text
    • http://giruzogenoxam.iblogger.org/german_regular_verb_conjugation_worksheet.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/maytag_gemini_double_oven_gas_range_manual.pdfIn PDF document text
    • http://jekigun.22web.org/god_of_war_4_ps2_game.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/transfer_function_of_armature_controlled_dc_motor.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/xomaraxurat.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/madugasav.pdfIn PDF document text
    • https://wisenuru.weebly.com/uploads/1/3/1/8/131856959/mopamew.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/3_types_of_services_ap_human_geography.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/88136883849.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/76912790663.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/67231803640.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/american_culture_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/lp_askep_bronkitis.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/22601608711.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/89628216177.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/best_computer_for_wow_ultra_settings.pdfIn PDF document text
    • http://satoposip.epizy.com/15182038634.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/44169627736.pdfIn PDF document text
    • http://lazuletezofik.onlinewebshop.net/calibration_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/authorised_signatory_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/88382976772.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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 5540 bytes
SHA-256: 4b3f5ce07fdaa46f2a734a682aea505c5720fa6407f32cdcebef0699f68ed236
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10604 bytes
SHA-256: 9c2ac53e0886f3d1519039c02fad565080dcc3c15eec0d5cf87a9998bd9bf33c

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