Malicious PDF — malware analysis report

Static analysis result for SHA-256 8450a5e3836dbb56…

MALICIOUS

PDF

121.1 KB Created: 2020-11-24 08:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a73e56a52633261b9a8a056b842ef66 SHA-1: 7cd6c7acdf3e2a51a8a0247fb9b633481d7ebec0 SHA-256: 8450a5e3836dbb56b33e41ff5fa59aa0069f28e2c95056b639626fcda0efc24b
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of an advance-fee scam, leveraging lottery or prize language combined with parcel delivery requirements to deceive users. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://traffset.ru/strik?utm_term=mastercraft+jointer+manual
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/taxadifupesafutom.pdf
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fade7439c0f2.pdf
    • https://tuxilumamiwuwuw.weebly.com/uploads/1/3/4/5/134582020/nixebugijomuzi.pdf
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/vozetovuxukelul.pdf
    • https://rukawaxosudeda.weebly.com/uploads/1/3/4/3/134308265/wetujuliwebipilasit.pdf
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdf
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5f95b37e1ab00.pdf
    • https://wenozujilemufo.weebly.com/uploads/1/3/4/4/134456287/milojemodexigal.pdf
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/32fab4197fc314a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/167e6d2e-e6f3-49ac-8fe2-f62f5369650a/ridin_dirty_mp3_song_download.pdf
    • https://s3.amazonaws.com/tezofuretejom/63145048375.pdf
    • https://s3.amazonaws.com/tesasubawalozan/add_fractions_worksheets.pdf
    • https://s3.amazonaws.com/numegubowalonan/batik_in_sri_lanka.pdf
    • https://s3.amazonaws.com/xesigeze/97211072131.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017512.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17512 6440 bytes
font_01_sfnt_off00018506.bin
54449ae29b1dcc60e2aa2d14e2e4444c46280d637c67766390cbd1692dbb161b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18506 5108 bytes
font_02_sfnt_off00019661.bin
48f93c6d540cd110e9f3e846092f7c8ca2fa60daac00079c4decfbb5917ab887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19661 12952 bytes
font_03_sfnt_off0001c1b9.bin
2f09cdb8223eaa674f522ff81c3cc229ef8b3b8fb1e770bd63559b353356580e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1B9 16164 bytes

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