Malicious PDF — malware analysis report

Static analysis result for SHA-256 497b8a557db3b97c…

MALICIOUS

PDF

84.8 KB Created: 2021-04-19 20:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 03db8ca51c82f8fff0a24ae15d100107 SHA-1: c3291ea02f198d1d1b5df28d44694c88b2ad4cde SHA-256: 497b8a557db3b97c91fb445acd2b754d110e12d664d7ada3bf1c9da6f6ffa417
66 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 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 0.9997

Heuristics 4

  • 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://bologen.ru/strik?utm_term=why+won%2527t+my+samsung+j3+connect+to+wifi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fff76d64e7f4.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/is_saitama_a_parody_character.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/hdbOihh/wimev.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/gagfTgc/kings_road_brewery_perth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5fe9563d9f30c.pdfIn PDF document text
    • https://cdn.sqhk.co/forebebeke/YYUhphj/bharat_gas_connection_surrender_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_60663987acf3b.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/lWFNzgh/dog_simulator_online_no_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fe05cd223fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491426/normal_602ac0c660b1e.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/xekezu.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/af7b3db6-ae5e-4ed9-93bc-2fa78d673266/fundamentals_of_engineering_thermodynamics_9th_edition_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/difolarafilemurim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042d30c3-e1f9-4a94-9032-699604f70c2d/tititeronedutewikopep.pdfIn PDF document text
    • http://gefosudevepap.rf.gd/kazak.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/bachelard_poetics_of_space.pdfIn PDF document text
    • http://gebogozomusedom.rf.gd/vayne_guide_9._20.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/konemuwivepumadibuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a5eec7-f560-4968-8cb6-7190a1157965/kuxoredudim.pdfIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/volipasupebatup.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/dewalt_carpentry_and_framing_complete_handbook.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_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 5648 bytes
SHA-256: 043cedd7b78b2dfe8b86f3128c8fecfe312cc5f33764be3327889f7d680567c7
font_01_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 10672 bytes
SHA-256: 9cc6a3a8d605c939d562c7381a1c4778a574a243bd1852541499aefbdf887145

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