Malicious PDF — malware analysis report

Static analysis result for SHA-256 781404bd3efc6ebb…

MALICIOUS

PDF

71.1 KB Created: 2021-02-25 06:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d26043ccccaa95095803669ff1c7bd23 SHA-1: 6b0ae2c2f0b42da8de82f3f98e76931e5d898027 SHA-256: 781404bd3efc6ebb16d2596acb34a5aedede00549ccde0e3d691436b3034a08e
302 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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/award?keyword=how+to+repair+registry+using+cmd In PDF document text
    • https://cdn.sqhk.co/jibetovo/TDhe6cU/49707030223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fec28c614cea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_5fcdb95238329.pdfIn PDF document text
    • https://bupitubijas.weebly.com/uploads/1/3/4/0/134040922/95c746db91636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fea1e159a520.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/tapexiw/wesix.pdfIn macro / runtime command snippet
    • http://zuputes.atwebpages.com/tubeverudofabegeber.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/wukewidewam.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/lezopobigeza/wizoz.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/fadupazageraf/poxezakosumokaj.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/apsc_treasury_challan_form.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/panasonic_phone_manual_kx-tga470.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/does_chick_fil_a_hire_at_14_in_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/bollywood_songs_in_mkv_format_free.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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 5516 bytes
SHA-256: e3065c2cc5ece424eb76022b7c0b7c60cfe97d25a92aec32d06809e906c0daae
font_01_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 10124 bytes
SHA-256: 9f8250995980f50ef459f1d61af628a43698b59c132cbf7848f890c8f0f3be53