Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a3506bc52332b8…

MALICIOUS

PDF

70.1 KB Created: 2021-09-08 20:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6607ffaafd81244c6baee275316d0bd SHA-1: 606c54e588da9b69d9da2a0b64b1ff6b0335238a SHA-256: 48a3506bc52332b8b1b8ce800c5821b632e35b9bd22bd5c6baaea5421cd1829d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pamukoglu.com/userfiles/file/42539068746.pdf In PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_CDB90C63ABEA969C.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/3777334711.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/kodugojedelipivewab.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/fewigilitabuwilopegol.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/makerukaxan.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/pujoje.pdfIn PDF document text
    • http://abwessex.com/uploads/files/romalukif.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/3608537333.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sobilatin.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/esrlkrbbd4jr9oqu99cdj0277f/99821383446.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/60105770117.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jezumonugalozi.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/17828222215.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/33485196630.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/wosupotegerapew.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/kabubaxerixok.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/ribuluxojidalo.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/tejenumefudafezog.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/98428227103.pdfIn PDF document text
    • http://mutitar.com/user_img/files/39573836774.pdfIn PDF document text
    • http://vtaky.sk/media/file/74424217456.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/wudivojovaj.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/96660393517.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/wovana.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/59224701276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=graco+4ever+car+seat+manualPDF 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_off0000b629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB629 14428 bytes
SHA-256: 7b8a32df682f67c0ea3ce9d827b9caf1cec3a9b6a151075e465879455024913b
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10584 bytes
SHA-256: 57051e20628c3f09cf4377233637dbc81c3593c051e18929181dd26f78909ff4