Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8608037d39b8b92…

MALICIOUS

PDF

104.6 KB Created: 2021-03-15 06:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e16757c258a65a7901bcb6c5fa723a80 SHA-1: 26334600854663fd14c959fab53f2515cdc95215 SHA-256: b8608037d39b8b92e1f91b3e885893c820fdb81c5b6000eea91519e1b60a045a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting and using UTM parameters, indicating a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to game-related content, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mezovuduw.ru/strik?utm_term=dark+souls+3+hardest+bosses+ranked+including+dlc PDF link annotation
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/vezidabomokigu-xeriduputitax-vababalig-monoxugove.pdfIn PDF document text
    • http://eurosett.net/witcher_3_strategy_guide_collectors_editionik2lv.pdfIn PDF document text
    • http://habercigo.com/fagufaxavelogonagamidalu61f65.pdfIn PDF document text
    • http://rubyshup.space/bifusadubolasuwivexgbfq0.pdfIn PDF document text
    • https://fulitadu.weebly.com/uploads/1/3/4/8/134863398/noramijaki.pdfIn PDF document text
    • http://legendbilisim.com/73593746473fi8ih.pdfIn PDF document text
    • http://opit.space/284734587949vl3s.pdfIn PDF document text
    • http://requiremcgood.com/throne_of_glass_series_book_1_read_online49bzu.pdfIn PDF document text
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/wavubon.pdfIn PDF document text
    • https://naguxamo.weebly.com/uploads/1/3/4/6/134655503/filub-koxasi.pdfIn PDF document text
    • http://copyrighytsupport.com/kemufebodomu9r37g.pdfIn PDF document text
    • http://kismykeitio.best/the_revenant_locations_canadaa9dla.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/ba08b6c5-7d28-4c27-940c-8df0c8757688/ncert_maths_book_class_8_chapter_4_solutions.pdfIn PDF document text
    • http://nasedelowose.rf.gd/28127502681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d05c93-1310-4e07-ab85-0a87ceeeb15e/matlab_programming_language_download.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_ad3ec4d641764b02bbfd9bcf6b4803fc.pdf?index=trueIn PDF document text
    • http://putesedesupelo.epizy.com/27365668474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53a5c8d-6fd1-4ff4-92c1-bee8931ceaae/can_you_bury_animals_on_your_property.pdfIn PDF document text
    • http://retuguru.epizy.com/transformation_matrix_rotation_90_degrees_anticlockwise.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_924891abfd8f49b989ad310f50961186.pdf?index=trueIn PDF document text
    • http://puwojewemuxa.epizy.com/wekodimamojelenoxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee387475-6389-444f-88f1-a94e71966e3a/7543838461.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_ff081b3e39e94f5690c2723ec022417b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa88953-6053-4fc7-936b-6c6e2cbfbd29/uglys_electrical_references_2017_edition_5th_edition.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_off00015ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE1 5568 bytes
SHA-256: 3920726f35e307c377306529e92208b7ebca22a1f0e928f83ff06005ed3d24ed
font_01_sfnt_off00016dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCC 11328 bytes
SHA-256: e237dacd4ae3692ef8a7090f019539f6b23479f65ae8a49acc6c40fc16ccadc8