Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba07539aa0c8528e…

MALICIOUS

PDF

84.5 KB Created: 2021-03-06 13:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c9fb1b55dd8bf97efa84bf4a0a16cab SHA-1: 9feca8d1d68e03fa19ea1904892b3f0a898f7c54 SHA-256: ba07539aa0c8528e6bfebe912d479ffed9547a989a8c544bf1411ea8de614bae
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=hindi+varnamala+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403952/normal_5fc827b035739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_6008687f4cd75.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/Vgjc0za/descargar_my_boy_free_gba_emulator_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/jf3mibd/line_rider_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405642/normal_60393b8ea7693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_6017878f70741.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/ja7OgcC/rokufafuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_5fd6edbe036e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_5fc994075c73b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5fda050a5947f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_25ecf00a70fc4a2b820988d399c0318b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9bf5f3-13be-410b-ac24-96461a4b5435/kung_fu_panda_legends_of_awesomeness_enter_the_dragon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf74432-3812-493e-902b-9eae9c64cb32/77823562987.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_cf50ec1893714a78a5240c28f7cf8d10.pdf?index=trueIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_ceb99d2ee7eb4460beafd1fbfe41ff65.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_19275c622d944a83bfdb1b238ca0e72d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f51ede-4c69-42aa-af92-5d8822e01a71/sabukowikupunifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/444fed55-0140-499c-9ba3-5653db06ee0f/2005_chevrolet_malibu_classic.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_bc207f93dbaa48ecbf1fd403971c7b41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba061642-0d28-463a-be42-35f3a8fe7dbc/craftsman_19.2_volt_ex_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcefe1a9-1093-4d8b-aca8-8018d6fc0579/2000_honda_accord_transmission_replacement_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efc8b33-47fa-4ba1-8de8-8bc6df6edcdf/what_does_e4_mean_on_a_blood_pressure_monitor.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 5244 bytes
SHA-256: 3ce394710b3b27b6206498d79fa4a97ffe315ad4915360e37c7a39f4fac25ec7
font_01_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 12948 bytes
SHA-256: 5b60b650654b624dc6c3e064b347166dfc1e10a315cec085e45cf8313047510d
font_03_sfnt_off000128a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A3 8316 bytes
SHA-256: 1f3f769f37a66eadd4a5a6cb7d12c7da2f28ec1c30476b7ee3226681fc03c4e5