Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea019e235a465e0…

MALICIOUS

PDF

67.8 KB Created: 2021-02-24 19:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dc16887082eda1a894eb26efd69366a0 SHA-1: d50d78e9ce26ebe32a03350ffe182c4ca5edf735 SHA-256: 5ea019e235a465e0241ba02cd683bbaa39e278b1c1b99f87c91042ead92cebea
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the extensive use of redirector links suggests a phishing or scam campaign designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://yafferge.ru/strik?utm_term=luxpro+psp511lca+flashing+heat In PDF document text
    • http://loduwij.scienceontheweb.net/11942515112.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/universal_remote_code_for_toshiba_tv_dvd_vcr_combo.pdfIn PDF document text
    • http://infokurs.design/agar._io_unblocked_for_schooloili1.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/etjfjiY/gefaxituwigizijeto.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/oaphjEF/vice_president_debate_2020_time.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/XhcTifB/my_boy_emulator_pokemon_trading.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/how_to_repair_a_agitator_in_washing_machinelm0zw.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/peselopufobituvofugeke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lunufisisosixi.rf.gd/momewubinu.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/2007_6.0_powerstroke_turbo_back_exhaust.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/kaduninubagolazokenuw.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/fz_bike_new_model_2017_mileage.pdfIn PDF document text
    • http://vuwepimu.epizy.com/hp_w1907_year_made.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/electrolux_vacuum_repair_shop_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/benzodiazepinas_chile.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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 5464 bytes
SHA-256: 4ca030d3b1e8313b02ccf40488efbacc888032fcc61a7f36addfedbe2ed5fc04
font_01_sfnt_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 10604 bytes
SHA-256: 76d42997148e5feaeba3c901340f40615ae7f10ff5061f38ebe9d8206ba33e5f

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