Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5712ac5d3f11339…

MALICIOUS

PDF

74.8 KB Created: 2021-05-29 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e81d83d83117ce3f0da65101c81f609 SHA-1: 3a3037789dee7c65782b5e830cc70332664c8840 SHA-256: b5712ac5d3f11339b5aef7735fa2bdcc6016754980877ff31c23efd62a0a497b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious 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://dafemum.ru/123?utm_term=types+sentences+declarative+interrogative+imperative+exclamatory+worksheet
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fc69087669b1.pdf
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/moxunaliragab.pdf
    • https://bujegeti.weebly.com/uploads/1/3/4/3/134355457/julizateve-sudasafot-zogigu.pdf
    • https://dipakiwafopij.weebly.com/uploads/1/3/0/7/130740044/55c27383d775.pdf
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/lolag.pdf
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6020a68f4bb22.pdf
    • https://radasezase.weebly.com/uploads/1/3/4/6/134643415/3862195.pdf
    • https://bigubuwona.weebly.com/uploads/1/3/4/3/134309174/vukutimozuwo-gaxibix-dabaded-tovidon.pdf
    • https://cdn-cms.f-static.net/uploads/4369327/normal_601a3da1adf6c.pdf
    • https://vuwonogi.weebly.com/uploads/1/3/5/3/135300132/tabebim_faxagaxafutu_xulijisolu_kikitap.pdf
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/mibojavutugazunefofu.pdf
    • https://cdn-cms.f-static.net/uploads/4478137/normal_60657305156a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9a608287-97c3-4b89-9b8a-de101f8632bc/29650592271.pdf
    • https://uploads.strikinglycdn.com/files/a0849b07-4152-4073-aa92-636997b76a20/shimano_ultegra_di2_manual.pdf
    • https://uploads.strikinglycdn.com/files/cb64fddd-17cd-42ce-bca2-fa177304625e/54136439503.pdf
    • https://uploads.strikinglycdn.com/files/cc5436c1-ccc1-4df5-9dae-885fe8c83933/jedimexi.pdf
    • https://uploads.strikinglycdn.com/files/66b500df-7301-46a9-b88d-e531125a580f/albert_pike_walmart.pdf
    • https://uploads.strikinglycdn.com/files/7861fc71-48c3-452c-97e3-b082f162e8f6/animal_physiology_richard_w._hill_download.pdf
    • https://uploads.strikinglycdn.com/files/94d610dc-9b75-4983-a373-26810149d528/42524933249.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_off0000e60e.bin
0873bfa5ad890b3d34a2e7b7d73ee69956bc6a2ff7cb5b57af1a787e87c67eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 5820 bytes
font_01_sfnt_off0000f9d7.bin
7ce5b8438cf8c16ac2b9edfbc9cb7f7ddead86f176fd96b9e90b42f8ecf9b3d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10408 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.