Malicious PDF — malware analysis report

Static analysis result for SHA-256 3881100b9f32a147…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 16:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ca9eb7bda6f9d7a83fdd761395bd615 SHA-1: be218dbb7a6e480a71a1ec96a2ae49cf7ce3126d SHA-256: 3881100b9f32a147f75c95f8b8c2ded594f18ee6b9a34e6601e575ccc47b9052
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, containing numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=glance+android+app PDF link annotation
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312999643759.pdfIn PDF document text
    • https://advik.net/userfiles/file/6658205232.pdfIn PDF document text
    • http://tfforming.ru/d/files/rinodopajunurame.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/nakesoxadujejekoguduri.pdfIn PDF document text
    • http://langmypham.com/luutru/files/13582995838.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/87835110042.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bozalomig.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/97310147862.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/zonuwedunifolal.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/fubefarewaxofuku.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wabitawiranikunexepomoris.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wapexesukilekubalilefu.pdfIn PDF document text
    • http://ctm.it/userfiles/file/32007807499.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/95140639053.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/subokozevenelebirizenuzu.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/81491916671.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cb94076493---tagoses.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/13941297090.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/lapup.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gejumisifovabogipi.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30968138043.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/96883adad148be057aff65edc35ab49e/xopip.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/fejorasijikura.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631151264.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://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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 10280 bytes
SHA-256: dbd9d53ab110357633e677e5e9b4ae22edb6fba889088860e7078668886454f3
font_01_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 15920 bytes
SHA-256: 67715c7c45d7531294cb47c9ea48cee863feec81c562fcce7b021a5d075e4936

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