Malicious PDF — malware analysis report

Static analysis result for SHA-256 539e2a81d82354cd…

MALICIOUS

PDF

71.7 KB Created: 2021-06-14 07:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3d35152bf836a58958d91c377fffd08f SHA-1: e0d8a5e48077b91814490f00fc01074b23f16211 SHA-256: 539e2a81d82354cd17036a9c5f313e075ed10dd99799ff334717a9593bad083b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users through multiple hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=winter+tour+mario+kart+tour PDF link annotation
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/ec20d3a.pdfIn PDF document text
    • https://voduvavib.weebly.com/uploads/1/3/4/0/134096125/pisokugok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_606e366533a32.pdfIn PDF document text
    • https://xomikevogonenoj.weebly.com/uploads/1/3/4/7/134743799/180047.pdfIn PDF document text
    • https://binamakizixevuj.weebly.com/uploads/1/3/2/8/132814618/jigubefuxifuxo_leseg_peboloxogusaz_walotuwozaz.pdfIn PDF document text
    • https://bavifevip.weebly.com/uploads/1/3/6/0/136049805/9b195f422af4a5.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/2b1f672a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_605115905295c.pdfIn PDF document text
    • https://xilexuluta.weebly.com/uploads/1/3/6/0/136094269/779de.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/sijalofebiz_rorijitubupemij_wotarumutuzavov_jopuzosikusurag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapaminuv.pbworks.com/f/cute_spiderman_coloring_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6368bb3-b678-4fdb-8218-4b879511d743/tosalovukejubogaropanas.pdfIn PDF document text
    • http://suwoluran.pbworks.com/w/file/fetch/144915843/zulorevokunuzizerozofede.pdfIn PDF document text
    • http://baxikufop.pbworks.com/w/file/fetch/144839121/what_foods_to_eat_when_carb_cycling.pdfIn PDF document text
    • http://gufabewa.pbworks.com/f/how_to_get_free_rp_in_lol_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156d91b7-1703-45b8-aecd-62047437736d/maplestory_m_dark_knight_hyper_skill_build.pdfIn PDF document text
    • http://jadudekif.pbworks.com/w/file/fetch/144964959/file_manager_apk_pro.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/55416968596.pdfIn PDF document text
    • http://wegisexi.pbworks.com/f/tabepanim.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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 4700 bytes
SHA-256: ac15bd2b6608c15b8280d0bdc2f262600f4ef2ac1982e5d9f0a63d739b7dcfb2
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 10508 bytes
SHA-256: 1bb14fff1e2dc3b88fb29676f7cf2193730557923901a38d4969758d954e564c

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