Malicious PDF — malware analysis report

Static analysis result for SHA-256 0523be85a8f46f95…

MALICIOUS

PDF

79.0 KB Created: 2021-03-09 22:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0e60a174bc29762bd37c70a958ce87fb SHA-1: 998d683bc51abed9f88a65b9f4105d41a6134fb3 SHA-256: 0523be85a8f46f95ec677b9c9e7f0b76045729d431b91c07ec6346c3bfc0f9e5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/award?keyword=direct+mapping+in+cache+memory+pdf PDF link annotation
    • http://nisaledax.iblogger.org/cisco_netacad_exam_4_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fe26c93eb345.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/e2w4idZ/she_keeps_talking_to_her_ex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_601a07a1c7db7.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/jcjgtih/escape_plan_2_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_60003c3ee028d.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/654339cb-eed8-43a1-bb62-207867fe16d4/what_are_the_broad_categories_of_aggressive_behaviors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3ebbb6-d1ae-4e71-8c8c-c55e89e9044b/47440788362.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/meranixebufizunu.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_deb200a595fe4d9c9b367ceb4afe6fe8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/29047584637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93585f1c-cc27-450c-a4b8-64ae07db264d/why_do_baby_goats_jump_so_much.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/57856057053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57716614-c345-428c-abd5-ebec7147390d/24990240617.pdfIn PDF document text
    • http://xamipekuxedatif.rf.gd/91283184715.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/10458748439.pdfIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_fc9e297ef79a4cf3a42556887ea464ca.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 5248 bytes
SHA-256: 280d697fb5b63e37a78687c3f940167483a1c86e727256792afbe8582bbb9caf
font_01_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 10492 bytes
SHA-256: 7308f349e28a5e857899d6915a380b5d6f8cb2e0d0f38c0acd434226f15bbb38
font_02_sfnt_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3