Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc25d70e2d8a29c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 09:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74c2cab06fa5a40df901b65c6a2f44b7 SHA-1: 2285248419948e8e85663c5ad093041a402b6b4c SHA-256: bdc25d70e2d8a29c18642ba0010eccfc2209100e11fb88faf02c672806138066
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification confirm the malicious nature of the file, likely exploiting PDF vulnerabilities to execute embedded scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://catamma.ru/uplcv?utm_term=dr+seuss+pdf PDF link annotation
    • http://hoteldanang.com/uploads/images/files/83738813172.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/mikud.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/96829724953.pdfIn PDF document text
    • https://scalper.ir/data/files/file/tasiwuliwedinezixu.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/44636220100.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/luxefegibejogironotubi.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/pakexumewojeteraxasumuw.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc270388f---ridenuwiwewusozexevev.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/6983443971.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/vovozov.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/vebitukonafomulalam.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sovigowiziruvuxezofek.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/97345919795.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/39437402818.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/92589503733.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/11054083187.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109162238305394.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/99442334144.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/45656980492.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/8726735389.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/46701887059.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/gajarogimukivolovo.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/11159512626.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/57950239431.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/piminaj.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_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 17716 bytes
SHA-256: 185c6bba12247da5e0bd1002a1cfff4a34df4c20eaf290a764a608adc3a92fba
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 9972 bytes
SHA-256: 93311a7d138c12ea12ee0049a25cda09a59bce629b401985a4bf3f51eae82c58