Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24f065f9ce4d3db…

MALICIOUS

PDF

90.2 KB Created: 2021-04-04 20:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1fc8d121b903ea88d0ee89d813308708 SHA-1: 5383145e07fac5ee3c0b76bd7c2f02ffc0603d38 SHA-256: a24f065f9ce4d3dba7a5bc8cb8999452f10a517a44b3b23cb0f575cccc6b8507
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://midufefew.ru/123?utm_term=ireport+5+cannot+find+java.+exe PDF link annotation
    • https://cdn.sqhk.co/fowoleleda/giHS0WN/25552703208.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/kapazarofofixux.pdfIn PDF document text
    • https://pafuxasakilufa.weebly.com/uploads/1/3/5/3/135327400/dofezivijepizukim.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/sheyegc/vininugikavubisekedim.pdfIn PDF document text
    • https://cdn.sqhk.co/feruwapusux/QFGiegx/42788485690.pdfIn PDF document text
    • https://jadilibetaz.weebly.com/uploads/1/3/4/8/134871175/fusedeg.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/10873409599.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/JHjhlji/95989765982.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/mapa_del_mundo_paises.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/Sjgjhhe/condado_tacos_strongsville_ohio.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/questionnaire_to_measure_academic_performance.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/lumudaxuzinimomuxuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/votiwixuduzo/0ugjjgc/mathematical_symbols_and_their_names.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/9ghjdif/rozonafudezunuzupisaze.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/Tjjohay/rolafuxazowedijiwewuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_fe681b6e9cad4dcfb292d19c5e8ecc69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/57166513590.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/17626549028.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_20cc186c851b47f793ac0a663cd058f2.pdf?index=trueIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_e18c43900ce94904baf20fe701158fce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajujiju/dijoko.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/durgapur_iti_college_admission_form_2019.pdfIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_61b89836cadc48e5858c36198966ab58.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5024 bytes
SHA-256: 2376979565690dfad344cad1592a885ead65121e9f6bdb7450211a1b6280a595
font_01_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 15736 bytes
SHA-256: 0b408facf56f21a2af0f89abfcdd30c3cea51c20ecdf1848f3a1cd1e3a066989
font_02_sfnt_off00013611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13611 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00014b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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