Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f53ef9841b878b…

MALICIOUS

PDF

74.9 KB Created: 2021-06-11 09:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d020664ac91759d729c342223705ad7b SHA-1: 739c74c8f120fc4cb449d615c3c62bba18726f80 SHA-256: f0f53ef9841b878b64e0d6779c02f63b03d2d6b8cb2fd289d963a23a095e3d18
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it is designed to host numerous external links. One of the primary external links points to a URL that explicitly mentions downloading cracked software, suggesting a phishing or scam attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=best+website+to+download+cracked+windows+software
    • https://cdn-cms.f-static.net/uploads/4418973/normal_606bfd06e5c7a.pdf
    • https://static.s123-cdn-static.com/uploads/4445573/normal_5fde4d1cb798e.pdf
    • https://cdn-cms.f-static.net/uploads/4451752/normal_606152c558b84.pdf
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5ff480663bbf3.pdf
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/1d54b249d64.pdf
    • https://lazetulomobepi.weebly.com/uploads/1/3/4/3/134326787/963eee872335504.pdf
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6056d71af01c2.pdf
    • https://static.s123-cdn-static-d.com/uploads/4417817/normal_60b4a9b574dc6.pdf
    • https://cdn-cms.f-static.net/uploads/4417997/normal_60c1f93a3ea98.pdf
    • https://kaximedefe.weebly.com/uploads/1/3/7/5/137513604/2712346.pdf
    • https://cdn-cms.f-static.net/uploads/4462374/normal_6043fa9b0343b.pdf
    • https://static.s123-cdn-static.com/uploads/4494874/normal_5ff273f097641.pdf
    • https://cdn-cms.f-static.net/uploads/4485153/normal_606a80883e776.pdf
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5ff372dee718b.pdf
    • https://cdn-cms.f-static.net/uploads/4410027/normal_602415412af8d.pdf
    • https://cdn-cms.f-static.net/uploads/4460263/normal_604196f188c00.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da5f731f-6066-470c-b0a0-64d24dc548d8/17969668681.pdf
    • https://uploads.strikinglycdn.com/files/9f089638-1355-444a-9f5c-3d08d7440a6c/quadratic_functions_test_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/48f8f4ec-a530-4255-9bbe-1e118dc6c5c1/6293227644.pdf
    • https://uploads.strikinglycdn.com/files/1452a120-1ec6-48a6-a36e-e589ce5a5a8a/el_camino_del_artista_opinion.pdf
    • https://uploads.strikinglycdn.com/files/dfa32c5d-6efa-4932-be89-de3d96997620/vibosorugerozemijag.pdf
    • https://uploads.strikinglycdn.com/files/eaeaf3f2-4537-46e7-9193-572ba7eb6a6e/susivalenulufufosuk.pdf
    • https://uploads.strikinglycdn.com/files/3c290714-56eb-44a0-b529-92fa8f0dc948/acer_aspire_v3-772g_bios_setup.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_off0000e906.bin
bfe912cfd73c556c9770fe59f62af64fe5ebbf89fd43425ed6d6587f5baaaed7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 5360 bytes
font_01_sfnt_off0000fb68.bin
13daa695e45c6a388533fb241e843f11e93707b8d13b9e88f6d417eff942df77
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 10156 bytes