Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ed3ebad37c25b4…

MALICIOUS

PDF

73.0 KB Created: 2021-03-28 02:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1c63156f8487750b746bf23190660e3 SHA-1: e993815fb6ab90d230955aec69197ade5b3242df SHA-256: b1ed3ebad37c25b47fdf7c42fbb5b17c2aa0656d54b5d1e5471a608ebbeb2e38
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to artificially boost search rankings for malicious sites. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. The embedded URLs point to sites offering PDF downloads, likely as a lure for users seeking software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=adobe+pdf+reader+8.+1+free+download
    • https://cdn-cms.f-static.net/uploads/4475570/normal_605b984fc8920.pdf
    • https://cdn.sqhk.co/nanagajog/jchbXjb/5029125435.pdf
    • https://cdn-cms.f-static.net/uploads/4451549/normal_6035778823b34.pdf
    • http://avto-document.site/lifetime_1268_streamline_impact_portable_basketball_system_44_inch_backboardvblqd.pdf
    • http://shoppermarket.online/bibekuzapusagojg8dst.pdf
    • https://cdn.sqhk.co/zebenane/hhbSp72/80184416648.pdf
    • https://cdn.sqhk.co/femelofep/diajalU/ted_bundy_liz_and_molly.pdf
    • https://cdn.sqhk.co/jotapepikota/bighimL/first_aid_for_burns_and_scalds._ppt.pdf
    • https://static.s123-cdn-static.com/uploads/4460686/normal_5fe1ebefaef8a.pdf
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5fe905e3b232e.pdf
    • http://belldiscount.ru/fobixomuwh9ewj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_06e183b3b0924cb9a1560595cfd8985a.pdf?index=true
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_abf1b2fdad824c50b0244b86e777efcb.pdf?index=true
    • http://xepivuze.rf.gd/38028013227.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_774c3b14cb304bc38121129189f8b1f6.pdf?index=true
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_748f30fbe95545d39759bd1d9fc00b95.pdf?index=true
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_daa6564fba3a4ac7acddeda34c7d2a76.pdf?index=true
    • http://zaposawo.epizy.com/lullaby_of_birdland_real_book.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbf.bin
8324422ee6545af596c61efd16ac46ed5fef3d2722897126c3e212b4e1fa4c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5356 bytes
font_01_sfnt_off0000f21f.bin
9a38a9a345e6fe3d5e30f62caf536c109d052fb42c449125fa2c0a47b4ec52c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10272 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.