Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf35164510aafebd…

MALICIOUS

PDF

69.6 KB Created: 2020-11-17 22:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddec8c985f3021bb8715023957dbc33a SHA-1: 1558363187cfd90b384e2ed290fc332fc8b0fe51 SHA-256: bf35164510aafebdeff105002b9dda944299d951d75b32a93799d1a1d8f302d6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely intended to direct users to malicious or spam websites. The presence of embedded URLs further supports this, with one notable URL being 'https://traffine.ru/123?utm_term=legend+of+zelda+romani'. The document's purpose appears to be to act as a gateway to other malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=legend+of+zelda+romani
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/karafopusi.pdf
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f918862bbe3d.pdf
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5fa88533dab38.pdf
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f8dc75ea9343.pdf
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f88548191a8c.pdf
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f9801b07cd1b.pdf
    • https://repemigikaji.weebly.com/uploads/1/3/4/6/134608024/bowutajoxefozakepa.pdf
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5f9f0824b3e7f.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f9079a8c5841.pdf
    • https://cdn-cms.f-static.net/uploads/4464524/normal_5fa9b7b00919b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/05e5ab69-8430-4df6-9789-9904630b76dc/praktikum_akuntansi_perusahaan_jasa_dagang_dan_manufaktur_kelas_11.pdf
    • https://uploads.strikinglycdn.com/files/aca81bd3-5a1e-4d7f-9c43-373863c48065/98113743067.pdf
    • https://uploads.strikinglycdn.com/files/5047a041-bd19-4f59-b860-0daf683f360d/70982130651.pdf
    • https://uploads.strikinglycdn.com/files/860b52a0-aa6f-43d2-8b32-0ed5c6e89b45/14375998785.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d489.bin
6fd3aa366e22fb504186bc73145574a08d35b62c482a0b9409d0307b32e91552
pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 5040 bytes
font_01_sfnt_off0000e5af.bin
6b2da222c963ea05625d2181135e6d0262d0a0276840d2f259e6bd81defacf3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10388 bytes