Malicious PDF — malware analysis report

Static analysis result for SHA-256 4236f47c7227d34f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-06 13:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0442a51811ab3450edc9d9c798cf3618 SHA-1: 26319c4317ba1bf76bc8672b18580a5770bb964c SHA-256: 4236f47c7227d34f584f11047cc05cccf272bba6ae44116b55ca62eabeac9c6a
244 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. It contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document appears to be a link farm designed to direct users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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=ffg+no+disintegrations In PDF document text
    • https://static.s123-cdn-static.com/uploads/4483338/normal_6008debe5421b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_601dd72b4e6ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_602a345a0d762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5ff844b505b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_60119a20e4a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_60334d2d94d06.pdfIn PDF document text
    • http://jasavutarapif.22web.org/tifagirob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_602863a65223a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_60200c03ef41c.pdfIn PDF document text
    • http://derobidav.iblogger.org/what_are_cognitive_behavioural_factors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_6041946568979.pdfIn PDF document text
    • http://xunajoza.22web.org/fimovasulaf.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/fad3c5ea-c595-468c-a576-4052e8c24774/makaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6c3fdc-fdda-499e-a338-371ad36093c8/git_commands_list_atlassian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbe28a9-4274-4cd9-b06d-5b1e2a6177bf/62648050569.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_58355247850548adb73c90f5cda62eb3.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_c86e09f39b3c41859b9bfc02b1d3518c.pdf?index=trueIn PDF document text
    • http://jepujaburadobiw.epizy.com/bearcat_bct15x_programming_software.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_7f71c282256d4478bc5632e60a8cdedd.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_c83af342ef784977b6e8e8e266a28f5c.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_5d54de402e75493d8de010af9dfdbbf6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17eda65-7b4f-484a-bdf1-ccfefd850846/5799701737.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 5000 bytes
SHA-256: 57d130881a38dc3dd3fd1996949f148d809bd6f6c3d2817b5164042a240e3e9a
font_01_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 10404 bytes
SHA-256: 36398412b2a4c019ba4341ac22d350f40a53b22a9f57e93e2756b84021f3ae41