Malicious PDF — malware analysis report

Static analysis result for SHA-256 0413daea63b79a2c…

MALICIOUS

PDF

76.7 KB Created: 2021-02-28 13:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b085d93acd7593000bdc422c5eb19f1a SHA-1: eff421cf6d87e2fba3d939bcfba2463a060d4ec1 SHA-256: 0413daea63b79a2cc0952b4f85020d0c0a85d23bc807d72d7a5e7339906f940b
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-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://vilenefex.ru/123?utm_term=best+top+load+washer+for+the+money+2019 PDF link annotation
    • http://megalit-korolev.ru/976820885583tiou.pdfIn PDF document text
    • http://crysety.xyz/msi_760gma-p34fx_manualr9jav.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/52440028379.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/ps3_holding_eject_button.pdfIn PDF document text
    • http://techanomic.com/chilly_gonzales_re_introduction_etudeshhqr4.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/82702055592.pdfIn PDF document text
    • http://extra-fon.ru/casio_alarm_chrono_wr_gold96zdg.pdfIn PDF document text
    • http://duplicwcnj.space/42328238769l7txo.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/71959721734.pdfIn PDF document text
    • http://1eyvgo.xyz/how_to_play_poker_at_home_with_moneyjl7ug.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/cell_fusion_cell_1st_form.pdfIn PDF document text
    • http://copyrightmediahelp.com/learning_objectives_verbs0thja.pdfIn PDF document text
    • http://idealica-ufficiale.site/puriwu58gld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofujuwo.onlinewebshop.net/69545906975.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/95033366565.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/tkinter_for_python_3._6_linux.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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 6004 bytes
SHA-256: f6535b539c2f6f7f51c560e62405c863d395b3348e1e80c9de9b275b906e866f
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 10504 bytes
SHA-256: 56cdcc855de546118eab1b62725eca8fcfe7ca219c7aae2653a72d5e2dafd773