Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bab3fdb792d125c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 03:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7631cde9e39cc47ca2cb363eae4d366e SHA-1: c01d445f32724b664a994545fc9500ca3afea398 SHA-256: 8bab3fdb792d125c23fc9dd672e8f04f9a5df361b6be64595e4ecd35d8ef7d2b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The presence of a link farm with multiple distinct hosts, including suspicious domains like 'msnladyboy.com', suggests an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://msnladyboy.com/ckfinder/userfiles/files/mamugigusigafe.pdf In PDF document text
    • https://labelmarket.eu/data/file/72361470855.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/ziputo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/55106934018.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/lemezutixopadubi.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/25749625401.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/14399097495.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/35681058870.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/ririr.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/satanemofudorizozurow.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1220613656612ffa533d0a5.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210906_B4F5ABE8E736274C.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/36024431534.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/figipor.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/50337104366.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/2903623863.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/fowobaxadipexixamopas.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5748522949.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/lenunatinedamaminot.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/27ef981ef2fb8f7a21613fb23fc5cf8e/zejorobasizoxuzoxigixuso.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/jemiki.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/44731365483.pdfIn PDF document text
    • https://anup.bo/images/files/36427526744.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d8b5f1fa2---debixiwuj.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/5571297214.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/wunukaruxajemasovux.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/nafazabebusozunakoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=adobe+flash+player+on+android+phonesPDF 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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 10732 bytes
SHA-256: b2aad7f7ab88b04fd09594a71ec0d9987449b0f65708f2dcfc7bbf25588bea2c
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 17512 bytes
SHA-256: 6745da9729e1cc1fc4cd52634e76594dfcfab353a01dad4ad45b6bfb07376cb7