Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ff9bd6867e5d82…

MALICIOUS

PDF

67.2 KB Created: 2021-03-09 16:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1bc91691a8c04e5d9ee12d0007320aa SHA-1: 95024074a43bf90403ca34740f9782064a0dd46f SHA-256: 35ff9bd6867e5d8277c52c5af87f189e2e4998f0ab0b515b67cc4de0e6e8211a
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-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://lozipotod.ru/award?keyword=social+media+campaign+plan+pdf PDF link annotation
    • http://nebofimanigi.sportsontheweb.net/55689345194.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/ahgs6ii/todd_rundgren_album_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fd1a7eb23763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_5fda5a497f890.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/laxixodobexamener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_6012116cd1598.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/cL57gh8/tufitalofexiwa.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/what_is_a_social_studies_elective.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/bobidematofumig.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/cc424dd8-f37e-4290-83d4-5bc84c426833/dragon_world_game_mod_apk.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_1521929afa87452896cb5415af73a56e.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_111b3037c5934c308f4df3508f40a59f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39567641-4112-4667-bba4-69f598df060a/what_is_gothic_architecture_characteristics.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_3f9077a8a5cd473ab3eded3e019166de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d101e7-776d-422c-9771-ec4533e62d8d/simple_graphic_design_software_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db15809f-e6cc-4826-af00-0b2a7540343c/xozegominasakupetetixemij.pdfIn PDF document text
    • http://fumibilulad.atwebpages.com/bonheur_d_occasion_livre.pdfIn PDF document text
    • http://rodisasedozax.myartsonline.com/cambridge_igcse_computer_science_helen_williams_david_watson.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_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 5304 bytes
SHA-256: d9d96d918705e51c27040265df3fa22c6f8db4bb2e154c095c27b81f6f5cc9ab
font_01_sfnt_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 10132 bytes
SHA-256: 642c87b8c91b83e7e3d398be9af1cd6035bec2f5827e73d09fb59f5b03042920

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