Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab50f2a35d0da25…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 18:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a457c0e103a44186a1dd35da44b76da4 SHA-1: 5150dd0debe1ad47f16a64e4f441d72d79191341 SHA-256: 3ab50f2a35d0da256f86271e47df818c7bc7d454ea79ec05078f8039130d6431
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://mayjack.com/upload/files/bikozufixekuzepowiludad.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1rj1q68eb36al8j6c36m3601eh/romuvod.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/gurizufa.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/dadufaxesaxateb.pdfIn PDF document text
    • https://comfort8889.com/upload/files/4440433368.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/34487998328.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/70992006533.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/55775497412.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/munumakikegazaf.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/66968344878.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sinuxevobodaxisomi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/19321a14f9e4291be7a3ec14f143df75/doratevow.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/43539018058.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/97825886433.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/35657343834.pdfIn PDF document text
    • http://elsped.hu/files/file/95988458786.pdfIn PDF document text
    • http://firegallery.ru/img/upload/84607069047.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/3735286774.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/koruvezozibo.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/517512670613731e111391.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/dafafarewekojijegogavi.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/2667885739.pdfIn PDF document text
    • http://aven.su/userfiles/file/runitajarukogoxam.pdfIn PDF document text
    • http://ijfbn.com/editor_up/vinugidapisexodesagipijub.pdfIn PDF document text
    • http://only-svet.ru/upload/files/dofimerexoxegijomuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=honda+jazz+2017+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 10444 bytes
SHA-256: f678574b556e2e5ce207ea75cbf3ba03823fd682763b940f192bf5e6f307c0d7
font_01_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 18112 bytes
SHA-256: 7abe354ff0698a0e20ad64caff81fb12c03d7568c2742adb5203375f9a86f69c