Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac687b0405c5abd…

MALICIOUS

PDF

76.7 KB Created: 2021-05-31 07:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 43356b2271d6be225d3cbd86658bdf0a SHA-1: e57e6a6f17460f7b35feb471d16e08e230f0611d SHA-256: 0ac687b0405c5abdb92fe1e02623d872d4de0dcfcfa97d6f02144415756263f5
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URL that leads to a domain associated with phishing. The document body, though heavily obfuscated, suggests a lure related to 'bcbs ny medicaid prior authorization form', indicating a phishing attempt to harvest sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=bcbs+ny+medicaid+prior+authorization+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390373/normal_6009afcb1fc9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_60619ad97e578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_6050232e5a9ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_606d8bfd756e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5fee19e45ab77.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/9b9895bf-beed-49c9-94e3-c2daa4f69527/essential_air_fryer_cookbook_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ac3bce-6280-47a0-b35a-cd9ebc25a124/why_we_cant_wait_martin_luther_king_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3832bab-9061-45c0-884c-efc4ea8d54da/how_to_hack_in_clicker_heroes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d26f39a-7627-4ecd-b7d4-183ee061ee7d/the_vortex_abraham_hicks_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995ffe3c-4d61-4a8b-accf-abf5da8e433c/rumaxijufakon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac748d1d-c917-43f2-a315-55cbc781ca01/banal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624bf01a-06d8-4873-9900-600c34373ac0/23710678291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9037b0e6-0910-40c3-9763-6b342e4f1a39/example_of_fiscal_policy_during_covid_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5462bcdc-1849-48fd-b9ae-13bcdda0b545/ejercicios_resueltos_de_probabilidad_total.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863edd38-bf31-4cb6-b8f8-cdc9118b2a5b/hoover_vacuum_belt_uh70120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/549f2482-f50d-42dd-b4ee-2ee4850b3b77/72209548202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b36315-638c-4994-8ceb-4c305e4097f4/2013_jeep_grand_cherokee_v6_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591ec251-b96d-41f0-9e53-ff5021381026/do_skullcandy_crushers_work_with_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a444a12-8a3f-4a92-935f-87c168597355/twilight_breaking_dawn_soundtrack_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498d5485-0e97-4f26-9cdc-81571373bed5/melujosonumiluru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43124c57-4e9d-405a-88cf-029835c96b8d/velokezuwamupifokejizikag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c76b41-2092-49ae-9c69-bdd48081d90f/how_to_become_a_jag_lawyer_air_force.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_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 5704 bytes
SHA-256: 0bb1d2db815ee850b7047e51c8aebe26df3d104cde69d45e0df8493991f4e7e2
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 11176 bytes
SHA-256: 12186599f04b32555ad733854d2cd6a3c98532f3ce1b331bad116b23a91771fc