Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b099c4ccd71cfa3…

MALICIOUS

PDF

83.7 KB Created: 2021-05-28 22:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa4a7f85432e6692f135405b76bdc778 SHA-1: 2344ee3ffb77afe9655c786647452d6482061ba9 SHA-256: 9b099c4ccd71cfa394c9c1a12c40b823eece04e91d20db0377dfe74791151b11
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure for movie downloads, which is a common tactic for distributing malware or conducting phishing. The presence of numerous external URIs and the ML detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=apocalypto+tamil+dubbed+full+movie+online PDF link annotation
    • https://sexewowoko.weebly.com/uploads/1/3/0/8/130873923/1d23139.pdfIn PDF document text
    • https://sawasorepe.weebly.com/uploads/1/3/0/7/130739445/bosavosazafaxin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_6008a628e51d5.pdfIn PDF document text
    • https://bizupuligal.weebly.com/uploads/1/3/4/6/134603830/2537866.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/navuraxu-xofijapivokiti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fcb197488de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_606d8efc19f20.pdfIn PDF document text
    • https://teretusux.weebly.com/uploads/1/3/4/6/134687242/koragijuvekenuwav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fe1a29da0fed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481289/normal_5fe116243fa6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_6045d71550f21.pdfIn PDF document text
    • https://juwabizaf.weebly.com/uploads/1/3/0/9/130969053/napak.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/fb49ac76-baf6-4af4-ad64-a7e2f9cd7aab/numpy_cheat_sheet_dataquest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16588e55-7c12-41e9-babb-d59f0fb09f06/najixukomumakenukisikesib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1c3870-f8e4-4c25-90fc-f263592e3f15/what_is_considered_full_time_employee_in_massachusetts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948bcb0d-dc9a-4590-85eb-02be14447945/setonovog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d13981-f053-4d1f-92ec-fb7b897cbae3/cuantos_metros_hay_en_un_hectometro_cuadrado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4d6d96-475b-4b91-aed1-02a316f95efc/88265626632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfeca7d-ee23-4762-ad95-59eddefa64a8/vusixarumopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d29a97f-e8ff-4fcf-9a03-ce415fb2157f/which_is_the_best_sewing_machine_to_buy_for_beginners.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_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 5320 bytes
SHA-256: b1879be5db274ae1da84186088aa30d930f30f541c14e0d622949dc1775957d3
font_01_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 10872 bytes
SHA-256: 6037e7514d9694db3f740c673bdfd47ade1f869b2b750a53e79c0d3514efb26c