Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d22f51a3d073ed5…

MALICIOUS

PDF

71.3 KB Created: 2021-03-11 19:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5266c45ce7b7fa2a7be46950d1a44a77 SHA-1: b0348fc165360a3cf47ce82bcf41bd20d4b98e1c SHA-256: 9d22f51a3d073ed5107ea7d4f9f99015dcc08ad8ce01651436b63c9421b32d5d
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and instructions for a password-protected archive further indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/award?keyword=bob+ong+books+pdf+download PDF link annotation
    • http://mavigawika.scienceontheweb.net/the_game_of_life_2_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/hDl82z1/pireverelorabobawoxemixe.pdfIn PDF document text
    • https://cdn.sqhk.co/xeveweno/aidibia/rebitapogamilenor.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/cjaghje/vumigafezip.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/pioneer_sx_950_receiver_amplifier.pdfIn PDF document text
    • http://ginixotojaru.medianewsonline.com/31624341059.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/xerisiner.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/kodak_esp_office_2150_online_printer_management_tool.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/generic_weekly_calendar.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/marbury_v_madison_majority_opinion_quizlet.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/jaxulozixojanugisi.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/wmhdNUb/silomefigoxixufevixip.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/ZWPqhaB/87326903869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romepasuv.myartsonline.com/a_level_quantum_physics_notes.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/learn_tenses_in_english_grammar_with_examples_in_hindi_video_download.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_94eedb7bdb4740ce90846cdf10026c6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee33069b-2e1e-42ed-ab6e-033eb3a00b31/huckleberry_finn_book_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aacceb3-66e6-4ba0-84ac-9b0c9e321dc2/wewabotiweg.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/07_honda_civic_service_manual.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_82b0da8c3e334ad289baf4e2ea2c9831.pdf?index=trueIn PDF document text
    • http://sogivuwe.onlinewebshop.net/myers_briggs_relationship_compatibility_chart.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_088a8d10d9a144d3a76af6c36c7b8c4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cb54ba-7b3a-47c6-93f2-ef224c2bd00a/krashen_theory_of_second_language_acquisition_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c847592-ae23-47a8-a761-dc1263b35f88/kubamebolifazekurad.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_5e9fac804edb4aa9a9fb79cc9b525bea.pdf?index=trueIn 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 5460 bytes
SHA-256: b1f1e4f9b9448e6557cb56742fb3ed9d8b2c8549ea7a3fe964ea5a3fc505d976
font_01_sfnt_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 10476 bytes
SHA-256: db309f2527576a76b9fed2c069113b8d2860e018f1bb29e2241fed3de09745ff