Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32a5c768573cfc0…

MALICIOUS

PDF

77.3 KB Created: 2021-03-09 07:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8000f495bc4426592adfb6cee0aea144 SHA-1: 5d1d4308973f57497fd3cc189c1bb2cc24fe149e SHA-256: e32a5c768573cfc0e852b2bb50aff617e6dcbaa1a3dcfadfb4ca699f602fbf84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=understanding+the+bible+verses PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387819/normal_6026acb49ecc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_603f7bbd734ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_5fd0df7706e43.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/iMDDU97/bangladesh_passport_renew_form_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/gfzicyt/pubutapaxiwasovuw.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/hjHXoQS/takevanudedugofolerekuki.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/hhggihb/54172073405.pdfIn PDF document text
    • http://bepebeku.22web.org/38105830372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_60059f2fa7a13.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuniruf/Xieiegf/cupcakes_recipes_from_scratch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fe6c64452411.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/0713130c-b303-4d52-b4d0-6595a56be6e6/fitbit_versa_lite_notification_service_not_running.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_416839e4132b44a6813de4aea69446fc.pdf?index=trueIn PDF document text
    • http://zumebixakefeta.epizy.com/life_of_frederick_douglass_chapter_11_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/85608447943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5e0e24-96c7-47dd-91c3-05dcc974af21/the_witcher_books_hardcover.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/15643654778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420d7aa1-1cb6-48b1-a42b-cd5848d04a70/what_state_has_the_highest_prison_population.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b96ac04-d67d-4e18-b18b-6a39a872036d/a_link_to_the_past_switch_hd.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_216927b5fc054c1382017e7f26e26460.pdf?index=trueIn PDF document text
    • https://1e5cef04-603a-4a55-966b-a4237a424a2f.filesusr.com/ugd/b56239_1a2c10996a9d45eb83a0794aad2c82c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokixetat/24342345505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f905680-29ba-42f8-bbdf-cc5d0b8b4876/how_much_does_active_guard_reserve_make.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/sewoninopuvasisamegix.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_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 5276 bytes
SHA-256: 0f1efd9dfb2ee24bda46d0533528e764d671277a4ff7fd2c1d85e9151d26e14e
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 10864 bytes
SHA-256: 3bb2d2702b28510a727efd965bb77317df25c7cb3d21786d1dba3039b0a0de36