Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ad87be70c44266…

MALICIOUS

PDF

59.9 KB Created: 2020-12-30 14:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 625b64dc7e0f02ea7282fb7085c3afa6 SHA-1: eb806a737a95f408e0ea3c5d57513952707caeeb SHA-256: 93ad87be70c44266200c0621c4f8d3038b20b9e818a766dc9e957ed3acd57a41
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://cctraff.ru/wb?keyword=science%20laboratory%20equipment%20worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5fd2546ab943c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_5f95015237ab2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474456/normal_5fd041748a007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5f8fcaa4dad07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5fb9c00096727.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/xuvejebevoxo.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/momifide_zirarak_pixoverirupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fe08dcd18a7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0bcb9b-0e25-4767-891f-62e230356447/five_paragraph_essay_graphic_organizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d9aa47-27cb-4253-af29-8070477ee88e/onde_estou_ou_aonde_estou.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05548b8e-1dae-4b0c-9623-3f3f32853725/75400895399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd336351-347f-416f-ba90-fdbbb9817448/59691916289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9c0f80-5e10-47bb-8eb1-06523f171bc1/girl_scout_games_for_daisies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b32a54-457c-40f6-8c1f-d6aab261c684/lai_guanlin_cube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1bebd1-8a8a-4a81-86d6-3b5b074747d1/rubojoko.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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 5800 bytes
SHA-256: 15f2fb3b7b0377108812900b54d5ff3c6261b95f2ca54143ee2506e1d4e55920
font_01_sfnt_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 9316 bytes
SHA-256: a4e3da0d5c1db2d9843dc20ad7c4de4969c614e61666e3acb260e480d5e059ba

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