Malicious PDF — malware analysis report

Static analysis result for SHA-256 286ca4497776d67c…

MALICIOUS

PDF

74.4 KB Created: 2021-05-12 12:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7410c67c8ede2fbff35a55d499100938 SHA-1: 1e4ca174990d76d425ffd069f02b4fe6f3237716 SHA-256: 286ca4497776d67c9a07261e694e3e67787329d35b8124dc5b3b57cbe97b0012
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The primary malicious URL, https://pelibifir.ru/strik, is associated with a search term for a Sony camera, suggesting a lure for a phishing or scam attempt. ML and ClamAV classifiers strongly indicate maliciousness, and the PDF structure itself is flagged for containing external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=sony+dcr-sx22e+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367631/normal_6021f42a19040.pdfIn PDF document text
    • http://reactivaperu-2020.com/kaxosabepigakukagikubinatzjpp.pdfIn PDF document text
    • http://biweekamnf.com/2016_elantra_gt8av6w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_602d26696f65b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_60231a4f072ea.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://tevfikyuce.xyz/xolokogikoguliretozoj5ehdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5fd1d10d4a10c.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://uploads.strikinglycdn.com/files/2f942563-663e-4a8a-a2e9-e8e8eb0fc113/william_shakespeare_sonnet_116_summary_and_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/epson_wf-2530_printer_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932c8166-9006-478b-86a8-6c35b0b3eac7/william_blake_the_chimney_sweeper_songs_of_experience_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c5c231-2afc-47b3-836f-12d3ad701898/the_magicians_season_3_episode_6_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e560e20-000a-4eb5-a553-eab042b4aa15/dulipumozarilomagu.pdfIn PDF document text
    • http://suvemavukefejig.epizy.com/42369584992.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/moduj.pdfIn PDF document text
    • http://konugatevokaxot.epizy.com/powerpoint_presentation_medical_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de74753-58c5-411b-81fc-71ede5e27b55/red_dapple_mini_dachshund_for_sale.pdfIn PDF document text
    • http://mudasaki.epizy.com/supugagotiresaxem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68139d17-00a7-4abd-9460-8b9ca474afdc/seores_del_narco_autor.pdfIn PDF document text
    • http://guvonudigadosa.epizy.com/dieta_atkins_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2782fb7-31f5-4e06-95df-a071a17689c4/calories_dunkin_donuts_corn_muffin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e481d9d2-2fc8-4576-b2f2-4bd505db506f/25713317799.pdfIn PDF document text
    • http://tubulufegufixo.rf.gd/44192901771.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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 4972 bytes
SHA-256: 5bb2235165faef1980f0dc62a8f8830a0e1d715e031432fc8dfad31710266fa5
font_01_sfnt_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 11160 bytes
SHA-256: 1db3877bc720ef7262089afee0c7320b5df12dc49f89e381120d6613b72176b5
font_02_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361