Malicious PDF — malware analysis report

Static analysis result for SHA-256 8156ac303107ccf7…

MALICIOUS

PDF

72.8 KB Created: 2021-02-17 18:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 13a544f8c8fd8550e462901abcd1e0d5 SHA-1: 22c309a8410d616cb2dd9439933972ddc5ed4059 SHA-256: 8156ac303107ccf7926d518ae76e8324a71efcd66ad10a91ca02e999a1726d10
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=wentworth+season+7+episode+4+full+episode PDF link annotation
    • https://cdn.sqhk.co/rubuxupab/8LnTgU1/jungle_cartoon_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/mjihdzb/tennessee_titans_coronavirus_news.pdfIn PDF document text
    • http://ryursew.space/where_does_oxidation_occur_in_electrolytic_celln4seg.pdfIn PDF document text
    • http://prizinsta24.space/armenian_music_free0w3xp.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/974bc446b0e3c.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/ehcieji/nizumumiso.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/penny_stocks_to_watch_motley_fooleznnt.pdfIn PDF document text
    • http://thesalle.xyz/zerirgmks0.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/phgjgge/45860180139.pdfIn PDF document text
    • https://bujakisuka.weebly.com/uploads/1/3/2/6/132695398/1191733.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/meIjfie/redurerozuno.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/zizene/baal_veer_1114_free.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/alfa_romeo_racing_italiano_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/bekata.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/bilinear_transformation_in_complex_analysis_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/manualidades_con_papel_corrugado_para_navidad.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/exorcist_tv_show_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/xabipizon.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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 5400 bytes
SHA-256: 4af80ed721a0e27f7aa02026971efd61e10c9c8088aead38f8e140f97ca75ba6
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 10648 bytes
SHA-256: 8327591516b4e519e3fada960f272d95be5a13550dc0b64045d8ad00852cd05a