Malicious PDF — malware analysis report

Static analysis result for SHA-256 094ec7b954430306…

MALICIOUS

PDF

169.5 KB Created: 2021-06-03 10:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 04e37952c2f0f5a32f0e28e0238a8c1c SHA-1: 20f76abf6dda93ab71f5d9e6f514c387c2a025a2 SHA-256: 094ec7b954430306a287d0e26eff35e56fb67335aecff093cc20a3cc244af696
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification of this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://coretry.ru/pbw?utm_term=ball+bricks+breaker+3+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402933/normal_605d88561fe11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fd68d5a0fa1c.pdfIn PDF document text
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/xoluvu_kabobuvut_zoxomalaloja.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/78ac5a7271f4a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478438/normal_5fcae4f940688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_606721f7c7ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_6034cf2e43f71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474470/normal_5fcd174025f70.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/musutojivatek_vedanazuwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368503/normal_6007fda04fb6a.pdfIn PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/115730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5ffd2ddc8ac94.pdfIn PDF document text
    • https://vodesaladamaju.weebly.com/uploads/1/3/5/2/135298616/nafow_matapofo_fefemuludep_jikesef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6060fc119a192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_5ff9e68189f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_60532d3ad9504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_60129d9a16bf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_6042dd4b9d940.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9a7d3c04-4e28-4ded-b2af-ffeee408a263/powerex_mh-c9000_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c230a9ab-83ef-4481-8f50-96df20947e8f/reflections_across_the_x_and_y_axis_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a202821d-9c17-4a26-b37d-543a21abcec2/descriptive_writing_examples_from_books.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/32654289889.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/determiners_exercises_for_class_8_with_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC40 22868 bytes
SHA-256: cfe43206d297a35b536105e92da5dd6d2fcfbd16fbf08b4b45b3e689c2d4a1b6
font_01_sfnt_off000244e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244E8 5236 bytes
SHA-256: 759f53baeb18cf1997825c6c58579b586f87857b167bff6d1e7b94c3d75d193e
font_02_sfnt_off0002569e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2569E 17116 bytes
SHA-256: 11fd1f86213898318d062b1c50d8012c15aee5e1166e6060b3a80b6a05404297
font_03_sfnt_off00028756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28756 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34