Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8a0f4442ab5cb2…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 13:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17c6b17cf9d5c243e84b25273e70cfee SHA-1: ea95019962df5d825804dfd645f336e26d990e63 SHA-256: aa8a0f4442ab5cb2e51cb28b277f4c4c57620cf117e2e109dca9a4dea9cb2564
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with several heuristics identifying it as a link farm. ClamAV and an ML classifier flagged the file as malicious, specifically a phishing trojan. The presence of many links suggests an attempt to redirect the user to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://senfina.top/uploads/files/nadeguvetoxomadumejedefos.pdf In PDF document text
    • https://macroedunet.com/userfiles/file/36396236978.pdfIn PDF document text
    • https://alohasafaris.com/files/gigukafumowogozo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c603275287---bufodolezatatogej.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/64971464947.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/ruxadup.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/7309050733.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/wotivaninixafaxukuwu.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/mitelidixezesupelar.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/15152670059.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudisijote.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/6373639673.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/zumogudemelogopagelivoz.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/sujiximosof.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/71659089931.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/vopigumasuvalume.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/14684685580.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/wakuwiduneli.pdfIn PDF document text
    • http://www.agot.pl/upload/file/siduket.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310844390084.pdfIn PDF document text
    • http://skene.es/userfiles/file/82795353528.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0935278f6cda34a43580d7b781f32247/46670630439.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/15011913801.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210904200911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=toca+city+apk+free+downloadPDF 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_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 10700 bytes
SHA-256: 7080b51b2bf7668867ebd4737a7689f6c081789b0af9eaf91eb44fd4e083ba64
font_01_sfnt_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 16440 bytes
SHA-256: d2a4bbcdb34075e8645b2ea182136b67dd4e3fd099262388541e8d234122728a
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1