Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ce20b82715f7dd…

MALICIOUS

PDF

150.3 KB Created: 2021-03-15 03:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1ae349d9856951d98bcfa01d76a0e354 SHA-1: e9e044f4162b3920db50a848754ab9d172f40095 SHA-256: 54ce20b82715f7ddb90b10e4188948cc12d1a7b8639f02883043a1f0a90f3a7e
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including suspicious links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://fokemale.ru/strik?utm_term=grade+9+vocabulary+test PDF link annotation
    • http://fbdirect.site/zudasobal515cb.pdfIn PDF document text
    • http://loginwithfb.site/solomons_organic_chemistry_10th_edition_solutions_manualn1x4o.pdfIn PDF document text
    • http://xanarixumafiju.iblogger.org/common_sense_thomas_paine_espaol.pdfIn PDF document text
    • http://idealica-uficiale.website/how_to_program_dish_network_remote_to_control_vizio_tv6z11o.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/gjhczif/briefing_synonym_auf_deutsch.pdfIn PDF document text
    • http://kaguveka.22web.org/gafeber.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/the_world_without_us_alan_weisman_chapter_summary.pdfIn PDF document text
    • http://mybiol.site/nuguxosakowazesixiwefoggtg6l.pdfIn PDF document text
    • http://boxidodo.22web.org/15418528326.pdfIn PDF document text
    • https://cdn.sqhk.co/tukutabu/jWmmgfb/knock_down_ceiling_texture_repair.pdfIn PDF document text
    • http://instasurprise.online/kukudakeccit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuvadik.rf.gd/looking_for_a_job_vocabulary.pdfIn PDF document text
    • http://livewimujekofo.rf.gd/sims_3_expansion_packs_for_mac_free_download.pdfIn PDF document text
    • http://kuzojif.rf.gd/75279320311.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/bandura_self_efficacy.pdfIn PDF document text
    • http://panidipelenaju.epizy.com/defense_mechanisms_worksheet_professor_hokerson.pdfIn PDF document text
    • http://ziwebizivag.epizy.com/jurilalesu.pdfIn PDF document text
    • http://matemot.epizy.com/mevojebasogupunaxosapak.pdfIn PDF document text
    • http://ladipuxot.rf.gd/will_small_colleges_survive_covid.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_off0002156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2156C 5424 bytes
SHA-256: f82970bec8af99ee6d493f8c5e074fa1515e844e0657df6beae32c0ab9aa7a7d
font_01_sfnt_off000227f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227F0 10528 bytes
SHA-256: 8f9eded0052a15ad5afe76dbc95f04e9801b9ddddb1ba62f1f87af718a262b4c

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