Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e00add5ed30138…

MALICIOUS

PDF

79.7 KB Created: 2021-04-01 12:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1081a9265979beaf23968071b16f9524 SHA-1: 950e6ade66009fa6741be13f9eec45f5646fa404 SHA-256: f7e00add5ed301383b5721554dcd100419a13d545da47d0852fdf32fd0ad23e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-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://botokaw.ru/strik?utm_term=student+academic+stress+scale+questionnaire+pdf PDF link annotation
    • http://wimudevereru.sportsontheweb.net/adjoint_of_matrix.pdfIn PDF document text
    • https://fimiwopagib.weebly.com/uploads/1/3/5/3/135315251/morojebulisomedor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471253/normal_5feb3db35aae5.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/gElictd/optical_illusions_art_lesson.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/pusaxakowasotosijujupaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_6028fa12e436c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_60361457b873f.pdfIn PDF document text
    • http://legexebe.medianewsonline.com/analytical_techniques_in_biochemistry.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/1262891.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/mhfgeJs/wekevi.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/hmNggHX/ice_questions_medicine.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/9155932.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32698f37-f9be-409a-9488-b1202ea17f80/16615110955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d27a540-89e8-4f88-941a-d09909c89ba2/how_to_apply_cast_member_discount_on_shopdisney.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/2596506581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8388d92-a058-4122-9fdc-2d1231ba577d/meade_lx200-acf_16in.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/calmato_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/kowukososatonowipegazepa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 5532 bytes
SHA-256: 28876531b99c6f0036457c43307ee71ef97dfa863a790e92e6c36a7f3b2128da
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10780 bytes
SHA-256: dfd6e966353b20ab42476d8ecc82e36d91a1d8c700629f6d09515075450142d9
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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