Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5510a5c348ac83…

MALICIOUS

PDF

78.1 KB Created: 2021-02-27 02:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1a4d1b0f61b3e008222aa1bd8f46f078 SHA-1: 45de55f9c55ab838b2fcb1daf77c0b816cecabda SHA-256: ca5510a5c348ac83c49b74a8e51e0c9ebd38f9cdec6e53e01342470238c77352
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://crophysi.ru/strik?utm_term=jupyter+notebook+install+java+kernel PDF link annotation
    • https://cdn.sqhk.co/xixofivib/ha1mOgf/defuse_the_math_bomb_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/biiJjgP/tutulinawalemerexupuv.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/h4ii0bA/5456417417.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/hkjdibn/bulokos.pdfIn PDF document text
    • https://cdn.sqhk.co/fixeruzef/eha3Jhd/history_of_african_american_hair_products_for_straightening.pdfIn PDF document text
    • http://digitaloffice24.ru/toro_brush_cutter_manualcgea6.pdfIn PDF document text
    • http://itclick.pro/liste_suffixes_franais0trn4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_601a9bb5c39bf.pdfIn PDF document text
    • http://pro-komp-master.website/tibexisixog4ol5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://viziwoje.rf.gd/manuale_stampante_hp_officejet_4500_wireless.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/38268734099.pdfIn PDF document text
    • http://sawutekoxa.epizy.com/39353333935.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/brunei_airport_arrivals_information.pdfIn PDF document text
    • http://wisalawisavu.epizy.com/zidemazekakegomuxodaliji.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/nukodojepuvi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 5124 bytes
SHA-256: ba938491e10cb127b70241c45ef35965c74b1f6547d6dd4d43790e4c63d585d5
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 11384 bytes
SHA-256: e98190dccc0045d57ddac2325b4c9ca9939239d383efc36198d8c2596361b1f3
font_02_sfnt_off00011d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.