Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e8913370fbfa2d…

MALICIOUS

PDF

61.3 KB Created: 2020-10-15 09:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6643476463779134fcd9006a6417dda0 SHA-1: df993e606a7f20e4647fd6fdf9da01a39c6c82fb SHA-256: 75e8913370fbfa2ddced180c1e01d2446ed3ef464a801972c69aad0e6c6cf9dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting domains and appear to be part of a link farm. One of these links, 'https://ggtraff.ru/123?keyword=terminologia+del+sistema+urinario+pdf', is identified as a known malicious redirector. This suggests the document's primary purpose is to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://ggtraff.ru/123?keyword=terminologia+del+sistema+urinario+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f87c4fa6786b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f87e3b58242b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8712c284ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f8766cda1e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f874f77a33d6.pdfIn PDF document text
    • https://site-1038771.mozfiles.com/files/1038771/wezukosal.pdfIn PDF document text
    • https://site-1041282.mozfiles.com/files/1041282/levurususoni.pdfIn PDF document text
    • https://site-1036944.mozfiles.com/files/1036944/zikitirajariru.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/jumufowubaboduwibipu.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/5988363.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/4028075.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/8960935.pdfIn PDF document text
    • https://site-1039757.mozfiles.com/files/1039757/30642026783.pdfIn PDF document text
    • https://site-1039349.mozfiles.com/files/1039349/zipiwuworujivotekij.pdfIn PDF document text
    • https://site-1038416.mozfiles.com/files/1038416/rarugajebakabuxeturix.pdfIn PDF document text
    • https://site-1039906.mozfiles.com/files/1039906/fodovera.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/b8f4e66e700fa.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/dugigen.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ef82e0d.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/vunidixeviro_xitosujitupile_kadape.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/3794757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 5308 bytes
SHA-256: 96d564ebdff28f07bb2fac1276c7637ba8e6c0d7659a8337d467661b2337b117
font_01_sfnt_off0000c321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC321 11192 bytes
SHA-256: 69e8bb5534670de643735a3b38c0957821d44579e6c4340742cc65fe93c1721d