Malicious PDF — malware analysis report

Static analysis result for SHA-256 4120908d31f89579…

MALICIOUS

PDF

73.0 KB Created: 2021-03-24 15:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8002c72a5be033e49c94a92f1fdff0c6 SHA-1: 6a2eff8e0c321442f003d453ffee87b328347058 SHA-256: 4120908d31f8957940bf69fb44a6881a071cbcf187c9a9995bfbb533713649bb
126 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('nipisod.ru') that is likely part of a phishing or malware distribution scheme. The PDF structure and embedded links suggest an attempt to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=present+tense+verbs+list+pdf PDF link annotation
    • http://stnold.com/night_owl_dvr_buy6fv81.pdfIn PDF document text
    • http://kittyplay.online/hatha_yoga_teacher_near_meznscv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_60534e6c84250.pdfIn PDF document text
    • http://italy50wow.pro/call_break_multiplayer_card_game_downloaddbk2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_601d21e83c292.pdfIn PDF document text
    • http://contentmedialiteracy.com/lol_worlds_pick_em_guidejeis2.pdfIn PDF document text
    • http://pihodze.com/how_many_calories_in_a_taco_bell_crunchy_fresco_tacozcf65.pdfIn PDF document text
    • http://idealicaitalia-official.site/61449694651oq0o8.pdfIn PDF document text
    • http://filmera.ru/why_is_my_arrow_keys_not_workingbe21m.pdfIn PDF document text
    • http://study-english-05.site/ryobi_drill_press_chuck_sizemj7w5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_d28984b9fa4e492f8366d842436f2495.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5695ead-8a4e-43d7-94e7-2313d7b8b6be/nc_drivers_handbook_test.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_e255465e710f41a1885800161b4eb677.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_c9e43499b45347f18672e858517bfbde.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_5b48b4ba575444f4abee16c1531d9a3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b24e7d2-3add-4ba5-b6aa-263c8f9e66c4/xaraneje.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/cat_s_cradle_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/cra_report_nil_remittance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab8318e-0bc6-46e3-9a52-dbde18a6dc05/73855528127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df82eea-5e41-4710-a020-99bd211dae9f/1999_club_car_ds_steering_parts_diagram.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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 5028 bytes
SHA-256: f4f7c90c8ff9c237b98f99ef2f06f2922d18f76bf33592d9ff8f3713167a7f38
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 10776 bytes
SHA-256: 667223557e7aa1253674ecfb403f9265f9ca4d0116b815b4554a8fa137f0905b

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