Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8d41ce8aecae23…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 02:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c58f46a2cfdcd524ee82df148d5c277a SHA-1: 5b7e948da9dc894a7d15694d033ec539de681b70 SHA-256: 3d8d41ce8aecae239026d49a20aabe7af9ea05e4b94f40eb4a726e9fc04fb3c0
126 Risk Score

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://dugedepap.ru/strik?utm_term=language+learning+programs+for+adults PDF link annotation
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/4cc9781a2fcfac1.pdfIn PDF document text
    • http://lorem.space/body_for_life_diet_meal_plana6ld0.pdfIn PDF document text
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/zejolitosinotoli.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/argos_cataloguelhzfr.pdfIn PDF document text
    • http://xenavowi.22web.org/nupipivugenokudi.pdfIn PDF document text
    • http://rezonansmusic.com/111400507980mshx.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/tufuta.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/business_partnership_agreement_letter.pdfIn PDF document text
    • https://suwitasejamuk.weebly.com/uploads/1/3/1/8/131856391/lulobulov.pdfIn PDF document text
    • http://beruzogumuxab.22web.org/top_rpg_offline_android_games_2018.pdfIn PDF document text
    • http://nunerixuvak.22web.org/archibald_macleish_jb.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/6dd3bbec39f39.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/ropidadegaxut/what_is_the_ethnic_religion_of_japan.pdfIn PDF document text
    • http://nubimopupugu.rf.gd/45150715002.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/61034118128.pdfIn PDF document text
    • http://suziwifu.rf.gd/template_powerpoint_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/24901842922.pdfIn PDF document text
    • http://jategemi.epizy.com/villain_bengali_movie_filmywap.pdfIn PDF document text
    • http://vawoxifi.epizy.com/fasevedo.pdfIn PDF document text
    • http://zatugawaxevi.rf.gd/mubazegemijipojadetewet.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_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 5300 bytes
SHA-256: ee329f5a06917c6100b1686bcc9bbad813b419930b09a04179cb366d3ae7c42c
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 11500 bytes
SHA-256: dfe91d170053707a31080686ab586d27d2b3ca08c66de5506c817f3bb09e978f