Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b315f41f2263db…

MALICIOUS

PDF

83.9 KB Created: 2021-06-01 21:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 902622fcdae93e54957e732c982c22d0 SHA-1: c5e9eedb6ebcafcbececde0c7d93edb58144fad7 SHA-256: 70b315f41f2263db55703683209cd5fa9d07bd48725a48a739b0dfd8f6fc784b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to link farms hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/pbw?utm_term=bajar+musica+mp3+gratis+para+celular+samsung PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425926/normal_6048ab535a036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468551/normal_605536bd8c350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_605417ab378bc.pdfIn PDF document text
    • https://jafufikatovovew.weebly.com/uploads/1/3/4/4/134481731/4a2b2f75.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/7825db22c0e89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopelijexuf.pbworks.com/w/file/fetch/144466131/fcpx_audio_visualizer_free.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/idmss_plus_android_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff9a014-88dc-4bb3-95f7-eaf88958d554/watch_thor_ragnarok_fanfic.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144440547/20938633792.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/why_am_i_not_getting_all_my_freeview_channels.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/devukavugejekatada.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/w/file/fetch/144462909/wajotawavarabonogoburipi.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/mongodb_university_m001_final_exam_answers.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144414633/81923966286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196babf0-3fb3-41fc-b33b-800d8951e2b4/how_to_charge_zoom_h1n_handy_recorder.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/w/file/fetch/144434676/98687736394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9814a6f4-5827-49f1-8c1d-32fb28111b5b/what_is_the_output_of_bridge_rectifier.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/nadetofojomotikotebupagik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246cd6e2-91f2-4e4b-a212-5e056bb4296a/sidajirowasenekamireg.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/zowezatomelifoz.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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 5544 bytes
SHA-256: 0cab85dc02da2ab7f93d45f215ee51ada04c379f5f381b0e3e00c7a03165338a
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 2688 bytes
SHA-256: 0fdf7907a0de8b95846298c1b20dd244625d4a915500df4e2cbf034f18ac7214
font_02_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11552 bytes
SHA-256: ce1dbb49bfa4be5be57ad52f18808770e944de3a96c934e1fc80198cddc2352e
font_03_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140