Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d48656b3cdfa5b…

MALICIOUS

PDF

96.6 KB Created: 2021-03-09 18:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33aa926cef41087d2f28252f7062bf04 SHA-1: bd56e7cc5f8010a38a7913df1f17d4b601c11ae2 SHA-256: 81d48656b3cdfa5b067a8714238d5c69067aaf979df7be4726e86dc77234f413
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The primary malicious URL, 'https://baarspo.ru/strik?utm_term=los+juegos+del+hambre+sinsajo+parte+1+online+cuevana', is likely used to redirect users to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to movie titles and software tutorials, suggesting a lure to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://baarspo.ru/strik?utm_term=los+juegos+del+hambre+sinsajo+parte+1+online+cuevana PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5feb1f93b9f25.pdfIn PDF document text
    • http://koxezuj.22web.org/falabejopobededidaneno.pdfIn PDF document text
    • http://vilurusunus.22web.org/46492322640.pdfIn PDF document text
    • http://adanakebap.org/sinhala_wela_katha_ammage_amuthu_selhoykr.pdfIn PDF document text
    • http://kvadro63.ru/522841693354tmrf.pdfIn PDF document text
    • http://itsnat.space/demoleqeth3.pdfIn PDF document text
    • http://paradusafe.iblogger.org/metformin_weight_loss_dose.pdfIn PDF document text
    • http://useplafond.xyz/android_google_map_remove_marker8gedz.pdfIn PDF document text
    • http://fifamarketbot.com/biginugiwegvzhk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd66dc472e82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5ff47b82b8315.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/c0aaff42-20c0-482e-8ef0-aee66d175f5b/ms_project_2019_tutorial_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777158c6-53c0-4022-b8ec-64cc3a7e8983/69098402209.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_f613dd947da2454aad7f4ca973d58ea3.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_2ed86de7a9784f27aab2ae83acec4d80.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_512156d85b064400a3d3a4900effdf10.pdf?index=trueIn PDF document text
    • http://sovizurimi.rf.gd/acer_gaming_laptop_price_list_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15aca30c-a1df-4d2f-b689-53087b512a8e/koduporizax.pdfIn PDF document text
    • http://tebafifara.rf.gd/caballo_de_troya_1_jerusalen_descargar.pdfIn PDF document text
    • http://fabomisibis.rf.gd/wirabumizonuxuf.pdfIn PDF document text
    • http://xebupiwemumak.rf.gd/43594876971.pdfIn PDF document text
    • http://xokukojowadoj.epizy.com/the_complete_book_of_gnomes_and_halflings.pdfIn PDF document text
    • http://lemefatunim.rf.gd/jovidibobadimosavujiwazu.pdfIn PDF document text
    • http://lefumes.rf.gd/3716710462.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 5636 bytes
SHA-256: 837c55c81674e2b7e39767f430cda145bf3a014b42970f44975faa7e4f4e7a9a
font_01_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 12744 bytes
SHA-256: e42b2d5caab413b5350d46926818bdd29a130ec841cf33e2e9dd16bc3aa2d7f8
font_02_sfnt_off00014ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 16364 bytes
SHA-256: 75a1dfbac873eef6c220ddc42b61017f79cb6febb4cdb590582d09fbde6e3a66
font_03_sfnt_off0001643f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3