Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f4f8ba76242e10…

MALICIOUS

PDF

73.9 KB Created: 2021-06-08 20:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0cf634ac31f9d4ca69ef7a10874eeafa SHA-1: cec877769ce056838eea26e5ac9ca8a571858b91 SHA-256: b1f4f8ba76242e1017e619e075d13cf9ac595f07b8e40875e345cdd44f9c651f
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards an attempt to redirect users to malicious or ad-heavy websites, potentially for financial gain or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://nomylo.ru/pbw?utm_term=percy+jackson+books+free+ebook+download PDF link annotation
    • https://lutokiwepaje.weebly.com/uploads/1/3/4/2/134266006/nobetafodi_wuxojikoxokigu.pdfIn PDF document text
    • https://tadiselugel.weebly.com/uploads/1/3/4/5/134589133/wunofakeb-rubulonadixazob-mutevigibix-domefaf.pdfIn PDF document text
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/b27a55.pdfIn PDF document text
    • https://wujorimumoba.weebly.com/uploads/1/3/4/6/134676457/4634189.pdfIn PDF document text
    • https://jozimegif.weebly.com/uploads/1/3/4/5/134528335/wejunafobero.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/8baf730.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/rupoziwejubipomoj.pdfIn PDF document text
    • https://segavaloberasum.weebly.com/uploads/1/3/4/6/134629474/7d5b9a.pdfIn PDF document text
    • https://zipesonavizi.weebly.com/uploads/1/3/6/0/136052153/levisokejabafikap.pdfIn PDF document text
    • https://nofiluwovix.weebly.com/uploads/1/3/0/7/130739726/1813c7e746d.pdfIn PDF document text
    • https://nebuxulusa.weebly.com/uploads/1/3/5/3/135306634/98eec751fcfa511.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/xaxamora_xunaxagagum_zewirigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144467562/how_to_file_certificate_to_file_action.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/73143384388.pdfIn PDF document text
    • http://dobifapig.pbworks.com/w/file/fetch/144658197/xoloji.pdfIn PDF document text
    • http://radejaki.pbworks.com/f/how_to_reset_zanussi_lindo_1000_washer_dryer.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/chapter_assessment_examen_del_capitulo_1b_answers.pdfIn PDF document text
    • http://nugurafuge.pbworks.com/f/2622795132.pdfIn PDF document text
    • http://disisopaz.pbworks.com/w/file/fetch/144811395/tetilu.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144415137/what_is_the_dramatic_irony_in_the_crucible.pdfIn PDF document text
    • http://natizasex.pbworks.com/f/najuxefosowebawubugog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3b8039-8c63-406b-be6a-c16707527f05/whole_steps_and_half_steps_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf9941a-cb14-4fc9-8a0c-036fb63737cb/feliz_navidad_chords_c_dur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b80231-fb4b-4244-9bdf-93dc27c5825d/how_to_clean_a_maytag_dishwasher_filter.pdfIn PDF document text
    • http://jabodawo.pbworks.com/w/file/fetch/144513261/zigug.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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 5492 bytes
SHA-256: a3a757e57c7a9524a78c8fb3ef8c1db30a1e96d16ab552d2ae52d25e5fd3429c
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 10420 bytes
SHA-256: 9866cda664725724ec55583c07555929a9a4429e7e76f020ff882df731e8e9fc