Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f74e24215e0d6c8…

MALICIOUS

PDF

79.1 KB Created: 2021-05-08 01:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 255feefd0f3308216c0113c4d64a438a SHA-1: 7a4583126e6d24716fe96bea4352a6e6ca2aebe8 SHA-256: 1f74e24215e0d6c87b01370dc4666b25bc0d449d1e6c574ae5628ae5b19b0774
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing external URIs and being a link farm. While no scripts were extracted, the sheer volume of suspicious links points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=are+polar+bears+going+extinct+2020 PDF link annotation
    • http://damvglaz6.xyz/pablo_alboran_discografiaw0swb.pdfIn PDF document text
    • http://espacecmb.xyz/55249220726v23i3.pdfIn PDF document text
    • http://vedice.ru/how_to_use_qcy_earbudst4b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_606e8cfd6d669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_60371e457429f.pdfIn PDF document text
    • http://senteber.site/7070003578940e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_60597e774c394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375358/normal_5fed8159862a8.pdfIn PDF document text
    • http://limuzinof.ru/is_vinegar_a_weak_electrolyte579kj.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/libro_los_beree55gp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384143/normal_5feeaa9b39c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_60192c45b319f.pdfIn PDF document text
    • http://org-fruit.space/monster_truck_offroad_mad_truck_race_official_videokgyia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fedf8c56fe9f.pdfIn PDF document text
    • http://myirn.icu/how_to_drain_a_cabrio_washerx5pzr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_602871dd0a556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5fdfa3dc18f87.pdfIn PDF document text
    • http://blablablacar.online/pamobepugojwpu9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_6036682aab068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408993/normal_6004b9991dba1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jomedive.epizy.com/crime_report_map_uk.pdfIn PDF document text
    • http://suremosanox.rf.gd/edgenuity_algebra_1_semester_1_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 5572 bytes
SHA-256: 39c6a9ecf84bbaa7fcee672e9c52fe178ba5017fc2739493e3ac8f300481f8e7
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 11412 bytes
SHA-256: 7fbef22fb35243fd53ac3ccfa1ebdcc4710339f6d2b29701851bd23623b1d9bc

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