Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b47f71838758dc…

MALICIOUS

PDF

67.6 KB Created: 2021-04-04 03:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 139fcfdae1385d1473b3e0912dedc609 SHA-1: 1942d2dd409c743c51890b0ab89d7b0004365e05 SHA-256: 71b47f71838758dcee31e25f8a53f3e4dcde6eec8d03d59ec987b7cb8998ecf1
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://druttle.ru/wix?keyword=red+poppy+teapot PDF link annotation
    • http://pet-guru.shop/sofikaz94va.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5ff782b844d4e.pdfIn PDF document text
    • http://kinoogf.space/sexawafuravemumuse9ffv.pdfIn PDF document text
    • http://fionainthefield.org/98859472201kutav.pdfIn PDF document text
    • http://sikirizev.22web.org/zumba_aerobic_music_free.pdfIn PDF document text
    • https://xubesizodumuruk.weebly.com/uploads/1/3/4/7/134703494/rodedudadamiraz.pdfIn PDF document text
    • http://nubolats.xyz/steven_universe_wallpaper_hde10v9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464734/normal_5fcdb5b99732f.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/9624773.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaxufedujij.rf.gd/invicta_watches_for_sale_in_pakistan.pdfIn PDF document text
    • http://gapexod.rf.gd/aurora_teagarden_books.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/83318449239.pdfIn PDF document text
    • http://terefikug.epizy.com/dakusabidogij.pdfIn PDF document text
    • http://zowipazivavi.epizy.com/bevoruzone.pdfIn PDF document text
    • http://kipafiperugava.epizy.com/67428260743.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/44642660883.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/diffusion_and_osmosis_worksheet_4_answer_key.pdfIn PDF document text
    • http://witoluteg.epizy.com/honda_odyssey_2010_manual.pdfIn PDF document text
    • http://tevufom.epizy.com/operatoria_dental_barrancos_5ta_edicion.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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 4756 bytes
SHA-256: 71fb3dac506765b6a3e6e4857a48ab1ceb88989983b8c9f51df60b4f048d8aae
font_01_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 10276 bytes
SHA-256: 4776caea7cfa8d5cc382f564ba12db584a7ae090e585cc54cfaa23ad0b0fa56d