Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e89c5376e24b73…

MALICIOUS

PDF

84.2 KB Created: 2021-05-10 13:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f4bac1546a9c5b0805aa2489fa6184dc SHA-1: 39281b0c916ddc13c4a5f29a0e334bfcc1f839cf SHA-256: 79e89c5376e24b7314173a0618b8dc3af4bbc31b3bba1920c015c9ce987868ae
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, including one identified as a potential phishing lure related to SAT math practice problems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/wb?keyword=sat%20math%20practice%20problems%20worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5fca488a83cd4.pdfIn PDF document text
    • http://nuverlites.online/8074008780983p9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488555/normal_5fef68d89fc96.pdfIn PDF document text
    • http://whalesqpa.fun/tropic_paradise_match_3_puzzlefcu1j.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/sistema_de_irrigao_por_asperso_convencional.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5fd0e69232053.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/botnica_livro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_601bfc9499008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_6035221242274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_66ea0382c36441b38121073b3bd94cc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f4ca4f-212a-4a59-b330-025b7fc5c79b/how_to_write_a_script_for_an_animated_tv_series.pdfIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_475a8e0b37ef438599197586c4529438.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/list_of_jack_reacher_novels_in_chronological_order.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_1e0c6457a3a04e7597c6a553923adfe0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/ragnarok_mobile_alchemist_skill_guide.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_159f9c12d6354211bdf0e358db232371.pdf?index=trueIn PDF document text
    • http://kabuzore.atwebpages.com/27976242926.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/small_fry_lisa_brennan_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8810507-3909-491b-aff3-5e01fc663d9a/pobugimanizikeporudod.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/general_knowledge_questions_and_answers_pakistan.pdfIn PDF document text
    • http://xekapakifujekem.onlinewebshop.net/viridumabup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc2d73a-4fc5-4446-897b-d8209d3512e4/1803674719.pdfIn PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_eeaac6506fb24622b539049e05fce97a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/partial_sum_of_arithmetic_sequence_worksheet.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.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 5572 bytes
SHA-256: a5b3348695755d773d348448256358ca86b19b20d3365e1153699113c97f0cf7
font_01_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 6068 bytes
SHA-256: d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0
font_02_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 12864 bytes
SHA-256: c05dbdcb05f566c84d9413309215afb59256c742e0db07d300c1a82d9487b64c