Malicious PDF — malware analysis report

Static analysis result for SHA-256 31db3fa968b26853…

MALICIOUS

PDF

79.5 KB Created: 2021-04-17 06:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 745e302e50e3121cb7da7e4a0b5751de SHA-1: de56e9f76bbb031163c69dfc60f50e2bbf7f5e52 SHA-256: 31db3fa968b26853707bf590a404917faf510d777beb448c078364aff808ca84
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL suggesting a lure related to "queen piano sheet music free". The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of many external links, including a link farm heuristic, points towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://baarspo.ru/strik?utm_term=queen+piano+sheet+music+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470688/normal_603a7094eb083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_60295d7e9ed29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5ff4fb5d9184f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393901/normal_5ffbe6242fb23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_602835541dd0c.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://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_99baf0c172804078b6e20d6a835da4d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/numerical_techniques_in_electromagnetics_with_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/how_to_clean_a_krups_coffee_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/tuzemi.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/moondance_drum_sheet_music.pdfIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_3acaeea509304483a3c3fffc43037f9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/golifewewokebino.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/what_is_the_safest_denture_adhesive.pdfIn PDF document text
    • http://xovefopu.myartsonline.com/application_format_for_leave_in_office.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/adobe_photoshop_free_windows_7.pdfIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_dc40e11b567d440eacf6c2d11c0a74eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/branches_of_science_worksheet_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/fimiwosunegojuxilawoxagab.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/54946705674.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/dstv_tv_guide_compact_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/zixegusixejuwaxajapevebi.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/how_do_i_tell_what_year_my_briggs_and_stratton_engine_is.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_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5164 bytes
SHA-256: 99ddfc8032d1521d6498e9c3f76f7bda1b4593afa85883498de0804e3546d158
font_01_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 11136 bytes
SHA-256: 240bbb7a0c35c6bdbc9c30a0058b3ba467e040e1749aa9d67fe8557e0cb312d2
font_02_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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