Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c8f432e3b900b7…

MALICIOUS

PDF

84.0 KB Created: 2021-04-01 14:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0583b082353c3c4081f7238e4af322dd SHA-1: e94dc24fb4a4f03b8eae36d361f928924128959e SHA-256: 12c8f432e3b900b722fb09899d7c230b8a8e976c21a591d212955c8f23102f7e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary URL, 'https://baarspo.ru/aws?utm_term=spirit+bloom+comic+espa%25C3%25B1ol', appears to be a lure. ClamAV and ML heuristics also flag this PDF as malicious, likely phishing-related. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/aws?utm_term=spirit+bloom+comic+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd6daa87d649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fccdd57cfe2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_604e183cea710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_601dba66b722f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_601b206ecb1a2.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/81489686910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_6064c41579739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_605904b7ee2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601a105c53c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_603e28f9c1668.pdfIn PDF document text
    • http://konolux.medianewsonline.com/blog_de_libros_romnticos.pdfIn PDF document text
    • https://surumisaw.weebly.com/uploads/1/3/4/7/134707241/balip_sodixaxodizibax_susejumunoje.pdfIn PDF document text
    • https://xuvifadeto.weebly.com/uploads/1/3/2/6/132682806/65e060.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/15c42075-9739-45ab-b092-16c0b42116ce/santa_clara_unified_school_district_teacher_pay_scale.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_7c3c714b470445f5a0e17509b69706b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5c8ca4-f2cd-4d55-996b-423c49f9bf6e/britax_roundabout_55_manual.pdfIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_32765216bdf64208b165918b84e8e6d3.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_601ba4bf84034137a13856faf0e68f23.pdf?index=trueIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_b514f34587b74b27bdee97c128a35c3c.pdf?index=trueIn PDF document text
    • http://bekusisit.atwebpages.com/xeduxinerifebofonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74845c65-2577-4e98-8be1-c578fc962496/duo_therm_brisk_air_shroud_old_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1396b508-5ba2-4dd7-b400-1c81b3bfee3b/petsafe_wireless_containment_system_vs_stay_and_play.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_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 5532 bytes
SHA-256: eb36bbe10eacb43fb6e0a8bba8a63118843a92fae5b04b3e9c8dde8d18510e47
font_01_sfnt_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 11996 bytes
SHA-256: 0107985972630daf518f9cac5c21c4abff3f3a615a4bfc8af302c8e30c543641