Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbfc8f9a578eed2…

MALICIOUS

PDF

79.9 KB Created: 2021-03-12 07:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f923d33c9a29d22bc6257bbf96d48c85 SHA-1: 6576285ab38e191d0488c50049c797448ada37e5 SHA-256: 3dbfc8f9a578eed2990f0c1b584de97a22a54408b79ca07d4b19f2977be2a83d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://midufefew.ru/award?keyword=neuritis+intercostal+pdf PDF link annotation
    • https://punofusa.weebly.com/uploads/1/3/2/6/132695323/882801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_602aa513b9670.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/5393464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6021a386049d4.pdfIn PDF document text
    • https://wozijosetat.weebly.com/uploads/1/3/1/4/131407158/rozeregulotaradive.pdfIn PDF document text
    • https://nabokopawupanav.weebly.com/uploads/1/3/0/7/130739772/2911026.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/xebenil.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/formal_dress_for_wedding_dinner.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/benchmark_test_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b32d18-df44-4265-9e75-a45f216756f2/vegumamubexatasa.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_9dedafe4e0734ab28217691ba9bb4b4d.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_47d599451d7f4d4a8ec5196f5cb2bb17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobito/2216004910.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/christian_video_songs_free_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a041e40f-b84a-4995-b594-6ccd97efee43/15417394490.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/adobe_media_encoder_cc_2018_p30.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/frp_bypass_apk_7._0_samsung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edde28c-07b9-4f1e-a4a7-1ad3de6d1bca/dodge_ram_replacement_doors.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/rcog_guidelines_obstetric_cholestasis.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_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 5120 bytes
SHA-256: 0f6d60e340ed46ebf55af1909b0d58765dd57143e208925b9e4f90bc6d969323
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 15752 bytes
SHA-256: 6d2d0d5ffb2f4c10378f0e39683fde530c955658044b4c288c7abff35cb31c84

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