Malicious PDF — malware analysis report

Static analysis result for SHA-256 870b1f578ead5779…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 08:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e826283286b3d8a45279775f022c2c31 SHA-1: de2a0cd82063db1a0b350c03acc46a56783740d3 SHA-256: 870b1f578ead57798708e8e545a4c7a5789867d1aa6f99c81fd9395308321bab
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=gre+math+practice+free
    • http://worabipupe.mypressonline.com/jane_austen_mafia_full_movie_youtube.pdf
    • https://sivabukejiwija.weebly.com/uploads/1/3/4/4/134459056/waboxenumizele-tofunemifibubuf-xesukeluvuz-xirexufuj.pdf
    • http://vevufilusik.scienceontheweb.net/larotawik.pdf
    • https://famopenagunabot.weebly.com/uploads/1/3/4/6/134688774/b86088774101.pdf
    • https://cdn.sqhk.co/nemovofa/dbPGPjh/photo_video_maker_free_download_for_android.pdf
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/1190516.pdf
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/f2cd280c810fed0.pdf
    • http://fortuneo.biz/fisimowudoda9d5hv.pdf
    • https://cdn.sqhk.co/vemoderama/e2xyjcs/cover_orange_players_pack_level_20.pdf
    • http://amsidisi.xyz/arduino_proyectosbiq57.pdf
    • https://netukilegulises.weebly.com/uploads/1/3/1/6/131606016/fuwijotuzerok.pdf
    • https://cdn.sqhk.co/rudolikube/ZFFihic/house_party_movie_poster.pdf
    • http://copyrightshelpcenter.com/phomemo_thermal_label_printer_reviewa7cp9.pdf
    • http://jafoxidulez.mypressonline.com/craftsman_13.5_hp_riding_lawn_mower_manual.pdf
    • https://cdn.sqhk.co/bubarozotuj/joheihl/blacksad_descargar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fidegaf.atwebpages.com/nojexaregavajupu.pdf
    • https://s3.amazonaws.com/gujutavevive/reformat_javascript_code_online.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_0ad7baf0952f47e6abc69e2f020fd717.pdf?index=true
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_8d9e9f91c8684dd291bf726bb0b8cbde.pdf?index=true
    • https://s3.amazonaws.com/zafirawit/22634271069.pdf
    • https://s3.amazonaws.com/pibabopuduj/27931481719.pdf
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_b0c6f07dbf3c4a10b67de37eb96d81ca.pdf?index=true
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_4155dac6aee341c88ca37ab5e82f4c3f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed03.bin
94dcb29ced6d25c4aafd8e0458e234897efe6d82c67450780cf3bc1514ccbd82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5076 bytes
font_01_sfnt_off0000fe21.bin
9e49792cf36ad12d3cd63c073444977d9710241bbcc73d5f19f74a7043f5d10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 11348 bytes

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