Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e0d16aa9b921ab…

MALICIOUS

PDF

89.1 KB Created: 2021-09-09 22:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d42fda14eabf56d42bf696683800bf9 SHA-1: ac6126b480e1d8bf7896563488f3b53550c5e9ac SHA-256: 42e0d16aa9b921ab74a12cc44938ff30cb524ceeda27bc1e4fbebe1292da95f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/80050140593.pdf In PDF document text
    • http://fields-on-earth.com/images/blog/file/linataxagu.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/giwapekuwemo.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/todosizezug.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/81356957545.pdfIn PDF document text
    • https://preciseenergygroup.com/media/xivubuwevakoxikuxon.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/setobuvufu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379e0e27383---82813248347.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/nivakezivuvawewifuko.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fogedamuzofowoderojag.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/81968052155.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/datowa.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/65462329210.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/72269454380.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/tibuxawudagiju.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a2362642cbd6917e3dd3c79af1f35415/20589419061.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fojamizubamenevidevisizab.pdfIn PDF document text
    • http://woykoff.hu/upload/file/vanivusuja.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/sajikategalaruxib.pdfIn PDF document text
    • http://mamitobe.ru/files/file/gimimolajamato.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/vulejeporog.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/jokubezakaga.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/sanalo.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/24900834382.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/mumizewufebeg.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/bufuduvubovut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=virat+kohli+funny+imagesPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 17620 bytes
SHA-256: c60f5aa9105210d23756ccf510a770d540008095c2affde3a1e4c4d781fbf4e6
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 20164 bytes
SHA-256: 91a1f8ce823a421d6d724a2d94754ae5baeb315be78a3d7b80f0b0abea0315bf
font_02_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 10936 bytes
SHA-256: 3e71e8ea363b2e18cd8ca2daea85131cf1ae924d12bccca6c980bfb0370c29f1
font_03_sfnt_off00013dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1