Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6b95ccde3d1b2d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 01:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87adf3a3f119cace26d5c7bb51ee3311 SHA-1: 6d863ba0afb3344f97348810bc5888be42555614 SHA-256: ac6b95ccde3d1b2d08d1d0ac394b8b42f89af6387c7bf44fbdae71ebe1d95e5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, with a notable heuristic identifying it as a 'PDF_SEO_DISPOSABLE_LINK_FARM'. The embedded URLs suggest an attempt to redirect users to potentially harmful content or for SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medical-1669.com/userfiles/files/84755682875.pdf In PDF document text
    • http://lorichphoto.com/pictures/file/13258860573.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/48888697313.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f824ea34afd9c9370acaf36e5c21c504/taziwoxapo.pdfIn PDF document text
    • http://rapet.hu/files/16395529598.pdfIn PDF document text
    • http://sov.tranovice.cz/webpagebuilder/ckfinder/userfiles/files/sizobolibogebakivanawilud.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/luzebexulasor.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/gelunukidewazuro.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc6c77c139---69398220051.pdfIn PDF document text
    • https://shunnasato.com/55081111708.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/tulepexawudajafenas.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/23432982961520bb627dc7.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/76009353476.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/14530662716.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/99004312807.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/16879016875.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/podunubofaju.pdfIn PDF document text
    • http://tercovci.cz/files/file/11420863792.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/siriwereninavozaduna.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45517693442.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/11400869297.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/80162342357.pdfIn PDF document text
    • http://rooptex.com/uploads/49624722962.pdfIn PDF document text
    • http://jonme.net/ckupload/files/xavawajoxilifobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=porn+apk+storePDF 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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 10200 bytes
SHA-256: 3fa1e3ac715323585fa213d52af9f1b53d4b62d46cc2b65870e0448b1fe659f4
font_01_sfnt_off0000c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 18204 bytes
SHA-256: f9044b9d309f1f242da8116f39d5d40303915179d1a6bc57e6eddb3b4f90212d
font_02_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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