Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff2deb93657c872…

MALICIOUS

PDF

93.9 KB Created: 2020-12-19 16:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a129da053befde82f962e6854cebbf2e SHA-1: 9ba874c587b53db5157b99cebf2ef12367f4e254 SHA-256: 8ff2deb93657c872c3eb8d0868c6fa8b7d3fa13dc005042d56728dc6a526d078
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/strik?utm_term=goblin+slayer+side+story In PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/5249136.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_5fdc02c824ae5.pdfIn PDF document text
    • https://janokapaw.weebly.com/uploads/1/3/4/3/134329878/328e65.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/waxapoz/satyanarayana_biochemistry_5th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/logivuzufiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/90848056939.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/2567985642.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/damigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8566f80f-e065-4303-89df-68f96a181107/parutuziwobetisevaje.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/vlookup_second_match_google_sheets.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000124d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124D1 2448 bytes
SHA-256: 46f81e778e6edddb5bd6dc9f58e5dcfcee3a5ff30b38a99e13fccdcef4355107
font_00_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 8624 bytes
SHA-256: 9c2b675f4b4869b3e5564923bb97ff6f087467368552cdcd0e9878cdb36f6767
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 5092 bytes
SHA-256: ab5d7340c383e6ca529debd27eda82ea3e4dfcee64cc0d18de8d4930c098d32d
font_02_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 8560 bytes
SHA-256: 3de3e9de5ff2d93fa648f000c22e3a7e8a6b5457067417e012ad2242c453d97e
font_04_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 11576 bytes
SHA-256: 27ede66c4c6d7bb532a03ddcdb450306fa371dd56f4c88ceb2e4e5932e7df8f3
font_05_sfnt_off0001550b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550B 2380 bytes
SHA-256: 11e6a5b97225bec1b521a9bd2230922c8e5f6e12ae95ca5433bb8e9c197e0171
font_06_sfnt_off00015edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDD 2652 bytes
SHA-256: f98eb24365568c6a06954dabdf40b4304e8c763159d0c66a4b68bc0acaa60b05