Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d34f1389dab470…

MALICIOUS

PDF

91.3 KB Created: 2021-03-22 16:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3ede8a00a751009b95506f1ad7c5707 SHA-1: 18f2f47ef1d4e41d59b02c739820aecaea8a32d0 SHA-256: d4d34f1389dab470538e5f6e8aab4e542509c4ea90577f5cfcf28bf5f6cda818
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/wix?keyword=magic+chef+dryer+1.5+manual
    • http://zitarekatinupas.sportsontheweb.net/70692936839.pdf
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/nonanurirezo.pdf
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5fe7c41b4e4e2.pdf
    • http://excschool.ru/vidovujujedz5ftr.pdf
    • http://naturwows.space/35933325862ksf68.pdf
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/xidogorazixemef.pdf
    • https://cdn-cms.f-static.net/uploads/4378599/normal_6039b54b4bf84.pdf
    • http://instahelpforbusiness.com/69642408028k702t.pdf
    • http://cardioactiveuficiale.site/las_escuelas_de_la_psicologia_resumen5so1v.pdf
    • http://oneitshop.pro/best_football_betting_strategy_everhvq8j.pdf
    • http://kakolamilasaru.medianewsonline.com/will_attorney_near_me_free_consultation.pdf
    • http://zexaribamemavi.sportsontheweb.net/lenovo_thinkpad_t430_i5_16gb_ram.pdf
    • https://cdn-cms.f-static.net/uploads/4458837/normal_6048befbdbb8f.pdf
    • http://vuwobide.22web.org/34945972521.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jajumuxepuj.rf.gd/what_is_the_theme_of_sonnet_18.pdf
    • https://s3.amazonaws.com/dotivaf/dragon_age_origins_awakening_game_guide.pdf
    • http://pudawetik.rf.gd/dafovosa.pdf
    • http://solugivewatewa.myartsonline.com/saaho_box_office_collection_telugu.pdf
    • http://vemesedesalo.rf.gd/chien_lang_2_hd.pdf
    • https://s3.amazonaws.com/zusevamasor/bisleri_camel_ad.pdf
    • https://s3.amazonaws.com/jevopemosod/able_to_extract_converter_free.pdf
    • https://s3.amazonaws.com/purixifusipelid/74635350395.pdf
    • http://tipipigi.atwebpages.com/73749975632.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99d.bin
afcc45b484cf053b4be195864fe80b14eaba8331ea56b9e1ed52a53405e2d861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 14224 bytes
font_01_sfnt_off00012786.bin
25c59faea361dbf782ac14fb1e1755bdd47334d207848767ab74724d3047e220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 5572 bytes
font_02_sfnt_off00013a75.bin
c71b6e38ec34d02ec08e69e943214a8e2e565aeb78c52ea045f760e15aba5808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A75 10312 bytes

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