Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5e39239bb58aef…

MALICIOUS

PDF

60.0 KB Created: 2020-11-21 22:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 33920057f44ef79525eab339bf91ee7e SHA-1: e409fa7e447f12875b68628a38a8c7bb4f5cefd6 SHA-256: bd5e39239bb58aefab5197d5622cb8ac2403d79c339071e102ee18222599b93d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://cctraff.ru/123?utm_term=apex+geometry+semester+1+unit+3+answers`. It also exhibits characteristics of a PDF link farm, pointing to numerous other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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/123?utm_term=apex+geometry+semester+1+unit+3+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5fa8438fb45bd.pdfIn PDF document text
    • https://wunimebi.weebly.com/uploads/1/3/4/3/134361225/pudavol.pdfIn PDF document text
    • https://zoseruvabu.weebly.com/uploads/1/3/4/4/134492528/bc282304b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f98062c570ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fa558f2cf0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5fafefa00c7c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5fa59177c8d9a.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/e6de25bf-ed5d-4c32-94e5-b2ecbb274311/niwafokekuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c5abd2-5721-48d1-ae8a-81cbe1c30aaf/wow_classic_pvp_guide_mage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1913e612-b9e9-43c9-a8af-b213ad5f0917/iso_14122-2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67beb781-4033-4b99-8cdf-5db7fbc81a54/sosikugotarib.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_off0000ad3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3C 5572 bytes
SHA-256: 6cde2971a0c437bff6e8ee9da464e3612e2f332dff05e9b970f283e0df723bf7
font_01_sfnt_off0000c04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04B 10596 bytes
SHA-256: c5631302b01d88060cee6499eaa32a6fd394355f5628915e87e457609fa2baa3

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