Malicious PDF — malware analysis report

Static analysis result for SHA-256 d733841659f4b304…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 18:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c5806deff7004da5ddbd08c2b6ee1cc SHA-1: 9e997b061ec9888508a3f1a02efbbae0e4008ce3 SHA-256: d733841659f4b304591562adaf07547449964327612abd5bb84f2285efccdea7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=d%2526d+5e+longship PDF link annotation
    • https://cdn.sqhk.co/dagozuwemep/hdTzhbv/tokaganefilixafobezavav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_6051ad2623401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_6066302f3ee98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_600a02d93e895.pdfIn PDF document text
    • http://levitajagukog.scienceontheweb.net/cambridge_english_empower_b2_combo_a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_5fdcd7700b4cc.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/basics_of_electronic_components.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/hipermodernidade_multiletramentos_e_gneros_discursivos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fdaed39dfc30.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/womigudime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_60225d0c395c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_60696c3282bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_6027ee49b474d.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/ghl0npV/20535221321.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/bacad5be-2a06-475a-8c95-830edd5a2c42/rinnai_electric_gas_heater_prices_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99be3d5-e874-4032-be02-6896c9e79088/gawitoberolovamafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74186ee-3aac-4afd-adf8-1b6829033826/bob_double_stroller_car_seat_adapter_chicco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cbf542-85df-401b-9008-c60f0a05b928/armor_landon_austin_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac15022-72bc-4462-b746-43bfd957245d/saviwitud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6afe834-aa31-4a75-a841-32f3dadc3865/vekipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c92aed-d56a-411d-847c-17f0a653068d/how_to_conclude_your_literature_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1517cd06-cd3c-4920-9e3e-1fbdaf5013a5/go_where_you_feel_most_alive_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1adf2cca-0812-49c5-add9-d8f5d3046a35/skyworth_tv_review_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a817957-9a6b-4145-996b-6191562d6b07/snap_on_2000_psi_pressure_washer_manual.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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 4156 bytes
SHA-256: 9253c4ec90eb8b217ae91b3aef6412788d3d1419415539c5cfb70110cf842fd1
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10760 bytes
SHA-256: b1a389f3722496a29084bd957f9ffb5ec8173638c5cd445c90d518bd4acc6ca4