Malicious PDF — malware analysis report

Static analysis result for SHA-256 beef3b548ec29b2c…

MALICIOUS

PDF

81.0 KB Created: 2021-05-01 08:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c1855287f3755e87ba95d376faf34505 SHA-1: d02bcda043d3e973ba5c69ea6e2d6065005d63d7 SHA-256: beef3b548ec29b2c170fbc46ea15c02c76d65e9a4cfb34b4e226ea6a5665a314
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the links likely serving as a lure for phishing or to distribute further malware. While no scripts were directly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://maypoin.ru/strik?utm_term=2012+jeep+grand+cherokee+srt8+value PDF link annotation
    • http://cancandance.org/the_kybalion_book_amazoncyw6b.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/naxev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_6054d2e1deeaa.pdfIn PDF document text
    • http://parrrtner.xyz/a_bug_s_life_imdb_parents_guidekm5uf.pdfIn PDF document text
    • https://cdn.sqhk.co/namemedoxake/P7Ibegd/school_bus_management_system_project_documentation.pdfIn PDF document text
    • http://gayerkan.com/39344779162x22uj.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/290f18def2131.pdfIn PDF document text
    • https://tidoleji.weebly.com/uploads/1/3/5/3/135396674/5798549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_605e005b5cbec.pdfIn PDF document text
    • https://cdn.sqhk.co/gimovitax/dhejihj/goxotenafefafokez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fe38af2d6d4e.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/zolejiriwibuzun_lubif.pdfIn PDF document text
    • http://libralab.digital/simple_spreadsheet_templates_free6vonw.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://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_da29b7b4e3e44517baab3a723b105d20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf25bd8-3b65-4e7f-b68a-8b4e8717b401/listening_skills_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875b5390-c69b-4e60-bb04-9a76489dccc5/physics_how_to_find_initial_speed_without_time.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_d3c4ab7b9ffe4f6d8d424a7a212e5ff8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07cd6a4-4ab0-41af-aebf-54d72e2dc18e/93279634799.pdfIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_3c677bd01fe24d79a7fe629ae1b7d2ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b483c2-5b36-4337-9f32-7588ce951c72/what_is_your_deepest_fear_quote_coach_carter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 5792 bytes
SHA-256: 8b23b1b19d4b7531811c10a58d69ff747bfc5c7c0e6104f3ffbad83237516cd5
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 11432 bytes
SHA-256: 9df3eca9a5c781968eb89052028686761288af5ffb86da3c89db74947b333991
font_02_sfnt_off00012876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2