Malicious PDF — malware analysis report

Static analysis result for SHA-256 706c91bd6a6b1454…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 01:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e74a2a78e14d9becf772ee01cfb2136b SHA-1: 443cf61fe4b5c5b7281ac7c40648ef8b1123125c SHA-256: 706c91bd6a6b1454e0ded4efa4fad2ebbc54d6a0848d4a1c23f1ea50758bc9d4
126 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, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with at least two pointing to suspicious domains that are likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links on disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=calendario+escolar+sep+2020+20+pdf PDF link annotation
    • http://vashastrahovka24.ru/oracle_pl_sql_basic_tutorial15vvc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fc9e8a26c54d.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/ahjZqii/canon_rebel_t2i_eos_550d_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/20ihfQG/pafinebul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_6045f23e42482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_5fd343bc068e9.pdfIn PDF document text
    • http://pro-konditer.com/refawujevafu8tjxf.pdfIn PDF document text
    • http://3gusevshop.space/google_earth_android76d9d.pdfIn PDF document text
    • http://taher-tcac.com/refraction_and_diffraction_worksheetg0dp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_605ac55021896.pdfIn PDF document text
    • http://thepropheticapp.com/73401483802mlp0y.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/hghb5gg/mufazusemajenelugawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fd61a962c7e8.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/jcMijhi/zuzeluxamifivelowaxulu.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/jiagi13/burger_time_arcade_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_5fd6323d5f903.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/c004105e-843e-4b20-8405-1102a60fcedc/8321431391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19a99a0-9f02-406f-be6b-3f44abc7ba07/pulegalugurij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f72378-4be2-43ef-a067-d2b349fcbde1/teduzavefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143c2f31-c7e3-4fe2-9ee3-b03afa932b19/desagafedavovewalugiwib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545e9e5f-916c-4df1-b149-e557dabb118d/7224901869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4097179-49dd-4851-89fa-18566054750c/towetaxobujokuzukasoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9992c9-2b3a-4db7-b84a-c560e122e768/66634942655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622f333d-9045-4094-9951-a6e83939933c/gadasixana.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_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 5328 bytes
SHA-256: 598669258339da82b33af9425624a8adbd3aa90b647b492bfd99f785be80740b
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 11728 bytes
SHA-256: e75243344aa4ba2db2d87266b7abbbeb96c0093cd3908d36a821ca093ccc51c8