Malicious PDF — malware analysis report

Static analysis result for SHA-256 409f1ab81159b0a1…

MALICIOUS

PDF

69.9 KB Created: 2020-11-19 04:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 834b083df4089435c2045f0818e6c69d SHA-1: c6b1f9ca067fd698048f79b6a2f0a98cdb1900c0 SHA-256: 409f1ab81159b0a1add6df61d87bef25c7cd01e75c1139c1ac0acd78b5026359
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=direct+and+partitive+proportion+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f870b556b9c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f911828d5f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5fa56d68174d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5fae84c988eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5f9c0cc25aa5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5f9453df00da7.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/90b51f73-9295-49f8-8296-4705f8834f68/77113550060.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/fimosusavufawoxemonisuked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af925c9-691a-4601-8c06-743fac101a3e/employment_verification_email_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3aba6a3-7bef-4b76-bea5-aedf4bed95ac/cert_guidelines_hosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99cc7791-f6b9-4247-972f-c84f54226199/pathfinder_kingmaker_dreadful_carnage_build.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/things_that_start_with_the_letter_v_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f3b36f-aa90-4f66-999b-83e32e75553a/wakisazavemutek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537340fd-05ee-4576-9416-0e996c29f0a7/juwariwiluzub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 2880 bytes
SHA-256: 5f03d2c6bc08d28d18892b3fd5153044a2fff6aad81dd629dfd07635bf6cf50e
font_01_sfnt_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 5344 bytes
SHA-256: a5c972e0159af20232b2737021d11ae1da4ef4d6b8d0f6819ad4d60f31fbde70
font_02_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10748 bytes
SHA-256: 04b957f50aaf5df8f59d13cdccf05985e46be289b8521a56da63ccb59b878ea3

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