Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da10da569d2df53…

MALICIOUS

PDF

155.5 KB Created: 2021-02-10 03:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 24b06e958f5e4893ccf80acda18d6273 SHA-1: c45a7aa8f76f0f71a4c0f8f6ead22b1b3b68297c SHA-256: 3da10da569d2df53ae6cbb54a00c26813cc99cf4f0dbd28b4979f92a644d41af
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to popular media, suggesting a lure tactic to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://crophysi.ru/123?utm_term=logan+movie+full+hd In PDF document text
    • http://wspring.space/vimedijaxespjl6r.pdfIn PDF document text
    • http://detonic-hypertonie.website/information_technology_for_management_10th_edition_freel857u.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/VLDTzIa/8533187193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_6017b9d653242.pdfIn PDF document text
    • http://goduvide.22web.org/aoac_methods_of_proximate_analysis.pdfIn PDF document text
    • http://cuzinfo.ru/79202668299ya156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467979/normal_5fefbc3d61694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411915/normal_5fe43c8653f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fd62a31d3599.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/Kib8ieB/ancient_rivals_dungeon_rpg_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/jdihgfr/79380968306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_600ce4f5224ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487658/normal_5ff26a51a5328.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
    • http://kiroxivox.epizy.com/acute_abdomen_ppt.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E77 3060 bytes
SHA-256: 276b322e57f8011458eb051afa8253290e5f2a761e567bde6374c3132e31aac9
font_01_sfnt_off0002195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2195D 4852 bytes
SHA-256: 7a8f66978f61e703cca37f033999456fd12b01dbb1bb04d7d13bb33c8602df9b
font_02_sfnt_off000229b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229B6 11988 bytes
SHA-256: 7e7b02d59dc4dd375acd77e119bb24aab4f6befbfd41052cbf8989e8d894d0c2
font_03_sfnt_off0002523f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2523F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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