Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a0a51f783cc059…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 10:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6ba5c7049288baa0fd04a0f26126fcd SHA-1: b6214ee157f780078068357d1c6c0ee060187636 SHA-256: 11a0a51f783cc059d28eeaae5cf167898c045330d76e45bc17b3569a20e16564
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or scamming operation. The PDF's structure and the presence of embedded URIs indicate an attempt to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=minecraft+gear+vr+apk PDF link annotation
    • http://mgocsm.in/userfiles/file/fegilo.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090713424610.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/83803805661.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zafazatumedit.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/rogem.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kixaxurusigateparu.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/toluzovokavokisoguritire.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/dunoko.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/ratirojoxojupo.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/dekunakitazow.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/sebufobibebibofubekasi.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/20144730147.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/dodokizunevulezitat.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/12136510375.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/rexalefefawudidufifun.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f20b4c000---95559885937.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/pefofetavivele.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/61784941312.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/gezirigevab.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f98f8b95d---visisowigigaz.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/gakosotimomanelukapide.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11260271731.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/53165125015.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/50929035368.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/47819767123.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7946559976.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_off0000bf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 10472 bytes
SHA-256: 79eebad657281cec4611025bc1ce329aa7b8bbc10a52ca5becde77b49591fb08
font_02_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 17224 bytes
SHA-256: ede5a56b4809fc638d56f415c60e0e6f0cdb2ef67ead408c3d1b3cc2d90bc84d