Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c4de9a65dddd69…

MALICIOUS

PDF

72.9 KB Created: 2020-11-10 11:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d8c34898934e09279e7c5fd4b80543b1 SHA-1: 1b5d483aab199c3b770ed391571956dec8cf64ca SHA-256: 84c4de9a65dddd69f73bbcbed1d8bf6f1d5eb58d5d091cfdf717e14b069aead7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites that appear to be part of a link farm or SEO spam operation. One prominent URL, trafftec.ru, is associated with a search query for a book, suggesting a lure to drive traffic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=prodigal+summer+barbara+kingsolver+pdf PDF link annotation
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/988db3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f9036aebeeac.pdfIn PDF document text
    • https://lerinajivawexof.weebly.com/uploads/1/3/4/3/134327174/342695.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/ecb19bb1-d594-4399-a4e1-0512a53293a4/67445912935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d9f734-7b8e-4dbb-9a25-6a3722ef8c4c/v_star_250_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeda826a-b46e-4b73-a1a5-99abb9da63f5/unblocked_strategy_games_google_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de140244-1831-43e0-969d-007a650b1eba/language_leader_pre_intermediate_workbook_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34121aa2-6b27-4ef5-9786-2ba976802d0c/clasificacion_de_fibras_nerviosas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5cf5b89-5f39-4e2c-8575-211c0296a3a3/67842185137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94d466e-3393-47b1-82dc-e84fb5d2e1e3/zejesugalakujafut.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/desu_desu_desu.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 5628 bytes
SHA-256: 4315822c9168f42bbe81dfc205be76054f4761baae0b3d753b1c844b6fca5d03
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 11220 bytes
SHA-256: 8ad8b61a052bc9e964dddd5586a1fdd9332c98f9c60273aef090b7de4b3f3d6e

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