Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1c9f4c080386da…

MALICIOUS

PDF

76.4 KB Created: 2021-03-06 07:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 266df4e4d22033f11265715360ab30fa SHA-1: 90b27b9b174be02647687e7b4a2434ab4ac33757 SHA-256: bf1c9f4c080386dacca2dd1c5be8374c1f9e0ffa2d53f637a91b4649e62235da
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=how+to+convert+jpeg+to+jpg+on+phone PDF link annotation
    • https://cdn.sqhk.co/jabezoxujo/Bidjjdo/italian_radio_stations_in_ct.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/AXgdCZt/johnny_lightning_speed_racer_mach_4.pdfIn PDF document text
    • http://dimax-matrasy.ru/bulomawamewuwakoxiwadut6odj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd3486652815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416512/normal_5ffa88a593a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_600d9a5d7c6ff.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/fjhcufS/kusugevurid.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/jjumQ9j/hashtags_for_instagram_growth_by_statstory.pdfIn PDF document text
    • http://m-laskin.ru/negemulewaruzelolateti6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_7644806b8abc4810ada3188d010a1b95.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_6eab416e74ab4b4b9de2efb6ee48bd45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/background_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/crusader_kings_2_immortal_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/mozonalowol.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/capitalismo_informacional_doutrina_economica.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_0cd00a4da5aa4b82962691838ca33eb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovuzize/29514727762.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/kebewatevapirifagogopijef.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 4964 bytes
SHA-256: 8c75de181dcb2702dee2110d492b77c2426078135dfe64ac512339f2bdcc2f0c
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10208 bytes
SHA-256: 5c390befb22ad28edf165436ce17406acd75f64360c6eea3839697d577dc21f9