Malicious PDF — malware analysis report

Static analysis result for SHA-256 804bd2c496722874…

MALICIOUS

PDF

68.1 KB Created: 2020-11-18 03:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0df73d7c5596720fa76efd4650d47738 SHA-1: 2e8997b799fea1699ec36d986fc3b5a9959faf00 SHA-256: 804bd2c4967228748397680b886b601f3e9c1401bf8bd8bb5f36ddc7a904969c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/aws?utm_term=abp+news+bengali+app In PDF document text
    • https://waronovubuwige.weebly.com/uploads/1/3/4/6/134631102/relezitimowij-sebibalakakewu.pdfIn PDF document text
    • https://jusopara.weebly.com/uploads/1/3/2/6/132681150/tadegubep_namijunetikezig_vukitikizune_pajaxobi.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/vefena-joxegevow-saxosedopaxeta-farorewufama.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/vuduj.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/f9ed5625-b651-4e27-ae33-fed0422c8e23/diablo_vs_path_of_exile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0510831-e721-4373-b667-f0079af8184d/girufik.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/ejercicios_de_sumas_y_restas.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/gmat_official_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0891a451-deb6-4419-9255-79eb9e88b897/sennheiser_md_441_u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cc01ca-f1b3-4d89-aede-66aa227630fe/81310859908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb71ff3-acd4-489b-9f56-8ef2d6bf1ee7/jojojoxazubitosoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39edf088-159b-42b8-829d-2e6a46dbb139/gutijivijusiwosugila.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_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 5112 bytes
SHA-256: ac228401addd283acd43da9cfaf6ed014dafc71ea097281bbc6b4ea9ce26c6d2
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 1936 bytes
SHA-256: 21a7146106e2ad29a4dcc6aa55cee169416400570e2b3d493b6d071cb256f2f3
font_02_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 10328 bytes
SHA-256: 306c91e0e8dc3a3e1ceab81c0040b46fdcef3759ecc1d865c303c79b7b305d7e

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