Malicious PDF — malware analysis report

Static analysis result for SHA-256 7595341fd545d6bf…

MALICIOUS

PDF

55.6 KB Created: 2020-11-07 21:55:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 28bd4a85f3d073aea7b0d3ad550e8511 SHA-1: c0c26cd20182f2563066007d714259430f94f944 SHA-256: 7595341fd545d6bf25788247526086452b54a0958836d99a683ab51348f88251
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same malicious URL. The ML classifier strongly indicates maliciousness, and the PDF structure is consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://traffmen.ru/aws?keyword=the+best+washer+and+dryer+combo+2020 In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/297c0.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/2eff971c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5f8e0dbdb2704.pdfIn PDF document text
    • https://purowuma.weebly.com/uploads/1/3/4/4/134472698/7752319.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/xotalulubami_bagetifus.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/b31c3ee3-239a-40fe-b65c-2adfcc6d5cfe/runescape_spiritual_warrior_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30dcd604-3f8e-4ec7-9458-b842a0f1752a/vojotime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec237fe4-05d6-4a36-af0d-78883eb58269/67316308715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a181e0-5e08-4b67-8cf4-c964781d5d97/rusote.pdfIn PDF document text
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/bekufezitowuvavibutapa.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/albert_camus_la_peste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f78990-8a4c-4e7c-97fa-d6c53878e07e/rivagiki.pdfIn PDF document text
    • https://wejogude.files.wordpress.com/2020/11/niwasegini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee61fc72-0311-4bdf-9910-c7ffbec68fa9/24924518652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba4b458-dca1-4e30-8af2-35de78013702/65248212795.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_off00009658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9658 5704 bytes
SHA-256: 5eaa93d6f51e5bdf874abd1fad4a90c2be4f8854f8d9df25a7131f0913c3803a
font_01_sfnt_off0000a9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AA 12196 bytes
SHA-256: 098405a179d9ca69d8b645e09c4a5df20bdf3503c179752f0473c8aeb56d08bb