Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbdd0cd34d4cb8a…

MALICIOUS

PDF

83.3 KB Created: 2021-03-17 11:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2a7fd283e7bf5e340be51d48b3c68b29 SHA-1: b99b213520584a63066b774243a843694c1f62dc SHA-256: ebbdd0cd34d4cb8a7133841affa25885b74331eb7a43765294c0ad7bfe8c542b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=how+to+install+gimp+on+chromebook PDF link annotation
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/fcc930.pdfIn PDF document text
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/mepakusis_burukupu_walotojevagaron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_601a09a2a192f.pdfIn PDF document text
    • http://zasijeg.iblogger.org/90396602100.pdfIn PDF document text
    • http://naxekularem.22web.org/62454951559.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/jurong_island_weather_report.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/xufus.pdfIn PDF document text
    • https://dekupepevimozis.weebly.com/uploads/1/3/0/7/130738652/bajirar-susona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393363/normal_5fed44e6e0c57.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/76bcf598-e28c-48f6-ab97-829798f09d0e/how_to_setup_a_fitbit_charge_hr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3404ad5-0313-4fdc-abb6-a3d4bdddb549/star_citizen_ships_to_buy_in_game.pdfIn PDF document text
    • http://wekameti.rf.gd/30099318027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0153b641-dd6b-40e6-af5d-edcff2116a47/39156830203.pdfIn PDF document text
    • http://fenubamijub.epizy.com/bias_fx_2_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ef79fe-415c-4f75-a822-68268939a9c4/what_is_pharmacology_for_nurses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2c8f8a-38ed-4a20-9e97-93867acc33f1/38756080142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639e4ba6-620f-4cbe-92cf-60b9cbd707db/bosch_axxis_f18_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f695f9d1-07be-44ed-8c39-58803b24037c/rigol_ds1054z_ultrascope_software.pdfIn PDF document text
    • http://wazuvit.rf.gd/charlie_malayalam_movie_bgm_ringtone_free.pdfIn PDF document text
    • http://retipike.rf.gd/1859301627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfaa8e9-1bde-4a29-9851-d406a75c84f5/93149778033.pdfIn PDF document text
    • http://zasizuv.rf.gd/midmark_m11_error_code_c633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89083f32-4f76-47fc-8df2-8b4838d709e6/logitech_z623_2.1_multimedia_speakers_-_200w_rms.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_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 5604 bytes
SHA-256: a797cd35ca23b9017630781196bc31e06c30ab5fa5d6f00ef3392dea12d87cb4
font_01_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 10776 bytes
SHA-256: e2df6e002abbdafa27f66519e17cab4abb65bf0e0f490b014a2a88e6c459edfa