Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caf47e7be02aefd…

MALICIOUS

PDF

86.3 KB Created: 2021-03-14 03:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0b80270a9486e9c62e0cb9d9f8003020 SHA-1: c717cfd7baf3d1cf69b7bef6c974089f202e5e18 SHA-256: 3caf47e7be02aefd4c453ca7ebf772cc1bc4d3e3e061e661feed27f69275ac8e
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged as a link farm, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://seumenha.ru/award?keyword=kptcl+ae+syllabus+pdf PDF link annotation
    • http://okrasote.info/supepagolekeselogofedawy4up.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/d2Ytjit/big_slice_ice_cream.pdfIn PDF document text
    • http://mazers.fun/9614585756848gzk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_600bcc8121457.pdfIn PDF document text
    • http://usblighter24.site/1936_ussr_constitution6wrox.pdfIn PDF document text
    • http://nozozofodedeza.iblogger.org/posupixexiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/jggegh5/93950835069.pdfIn PDF document text
    • http://gafaneripebenu.iblogger.org/17168913106.pdfIn PDF document text
    • http://scoretdho.best/20954321206dmlve.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/ebt3QJA/xitekamawidekinosabup.pdfIn PDF document text
    • http://omoikiri.info/weekly_personal_budget_template_excel3yt5r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_60404658d02da.pdfIn PDF document text
    • http://bigno.space/dukuwekepdnn7v.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/Mjj2ric/bus_driving_simulator_for_pc_free_download.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/kanda_sashti_kavasamvlqk1.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jasumubi.rf.gd/27280186402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f666dd63-0638-4223-8874-6e205160f78a/93191817313.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/tor_browser_apk_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0879ed5a-13ee-45dd-b5a1-0bf445c923a2/sojazeditabukuragupub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5084b8-a3c5-4b28-b141-cac1d9a106b4/how_to_use_api_ammonia_test_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2241f2-10cf-4d54-b961-297efb169281/campos_de_accion_de_la_psicologia_social_comunitaria.pdfIn PDF document text
    • http://xedaxujaluzi.rf.gd/tovafake.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f310.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF310 16656 bytes
SHA-256: 3fb31ce1f9df0b42f051403af417eb8cbc7dd0c1d06ed392f2e991392c0a19f0
font_00_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 4880 bytes
SHA-256: 164407dcceec6d63821e72b6683e3a559bcf6471246acf290ddbda0167708ca4
font_02_sfnt_off00011998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 10456 bytes
SHA-256: f8003e56fe7a966c6ec581db9a9929fdf672d9b25b6b0403edcdf1b43c48b7d8
font_03_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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