Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6c8b5538a8d40a…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 13:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e8d1e808e5973f0c596c0fc0dcb50640 SHA-1: c0cd3f734e87843f6035ceb3af970c5f723f8ee8 SHA-256: 8a6c8b5538a8d40a2a2e51d1d6716242e121307d7d7aea9007ad1171ec322513
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to a domain associated with SEO link farming and redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/strik?utm_term=how+to+have+a+positive+mindset+in+sports PDF link annotation
    • https://rokumipizo.weebly.com/uploads/1/3/0/7/130776068/fopipofinatil_lekegudepomese_rugupuve.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/yx5igPV/xevifiliwudutafelifag.pdfIn PDF document text
    • https://cdn.sqhk.co/powitaxixu/fjeaBfZ/48675706908.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/84bf47c85.pdfIn PDF document text
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/fb66cf26.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/ljfEgex/55972736642.pdfIn PDF document text
    • https://gojesewemuvi.weebly.com/uploads/1/3/2/6/132681304/vajovuvawunutob.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/jaVDShi/lego_marvel_superheroes_2_switch_save_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakusineba/answer_for_thank_you_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/afterlight_2_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/jukebox_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/is_skyworth_tv_worth_buying.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/siwozoralidizabirizeve.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/pandas_excel_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/wadadewijupelukuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/fgo_little_santa_alter_event_guide.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_82177f1f9dfe411e8d400d46daa486a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/un_poema_de_lengua_indigena_y_su_traduccion_en_espaol.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_3be73428c78b48908c72f8ac0114c7b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/midufebopowije.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/namemugozoza.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/fibreglass_roof_sheeting_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/breitling_aerospace_avantage_e79362.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_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 5280 bytes
SHA-256: 989c9d22c976f2ee467973248a91af48904351a6c6c14bf7ed8010ea36cd4235
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 10888 bytes
SHA-256: 6652a077b6869b686f03af68371b8b379080ec1a950171213f91a47c0f976a06