Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6fcb845a3f61a9…

MALICIOUS

PDF

68.8 KB Created: 2021-02-16 02:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 91d60751c79aba4aab043e278669bc58 SHA-1: c1a5369c96e5e9519ac8bc93fba7881edbc37685 SHA-256: 3c6fcb845a3f61a937d268b84d0cbc541906f1eec6b809da537f058adfdef5a2
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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/wix?keyword=the+challenger+sale+ebook+download In PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/4ea71b.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/7Mjc0ic/tiromatubavobezujexasem.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/1heXHDx/ram_drift_car_simulator_3d.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/c3cdcc.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/1zihhe2/dollar_tree_locations_toronto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_600f9b38d929f.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/Ohfiejc/muraxiwiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_600ad7b73e331.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/io1geig/3d_ultra_minigolf_adventures_2_ps4.pdfIn PDF document text
    • http://italywow.space/10619505344j7ra7.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/vozek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392871/normal_6000124d0e2e3.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/igijagd/pudog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 5444 bytes
SHA-256: 83ee6f044d1e04c54b0b198978c1466ea5b246aad591a098417cf7546d74e933
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 10392 bytes
SHA-256: 795e8a2a10bfb707f9694a9d8de1cef962c7fc3fc0e69c41c09e61f608fbc1f0