Malicious PDF — malware analysis report

Static analysis result for SHA-256 558542c186dbe772…

MALICIOUS

PDF

80.7 KB Created: 2021-03-08 04:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7a1f8bddb8c4401d9b205aa9e2a7dfaf SHA-1: c6a1ff5a909a0e637fbd87a471f539028e293bc6 SHA-256: 558542c186dbe7720f94e19d3e3a2508f1e62b0f0bf4ebf15deb70a6b734f18b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing. The document body's obfuscated nature and the presence of external links point towards a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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.
  • 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://xezojetit.ru/strik?utm_term=sigma+bike+computers+uk PDF link annotation
    • http://newberginvestmentproperty.com/mubewobinamewzhnn.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/hdbjhGB/84725841847.pdfIn PDF document text
    • http://masterpowerpoint.com/93883186549uy1eq.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/IiaRhha/starz_series_2020_richard_gere.pdfIn PDF document text
    • http://tiktokhd.design/4.3_l_mercruiser_engine_oil_filterye3zo.pdfIn PDF document text
    • http://businessmentality.com/diffrents_types_de_contes4cdxc.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/JhjeUTo/descargar_apk_story_saver_for_whatsapp.pdfIn PDF document text
    • http://topvideo.design/beyblade_burst_app_rise_updaterfhgr.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/eicTjco/cruises_out_of_galveston_2019_3_days.pdfIn PDF document text
    • http://sefajoga.iblogger.org/debtors_reconciliation_template.pdfIn PDF document text
    • http://mavurelaro.22web.org/51898543167.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/pibmigl/wuxubewuves.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/ecMYig6/pipotosegoderiji.pdfIn PDF document text
    • https://cdn.sqhk.co/baponakazu/c43jbig/sadipikivopoxutej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_e9cb40e62f8c4b5288c09b9143326d46.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_a13bc6329aaf4ffbb017fcc6ec4fdd26.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_412d605873df4053b282c9bb45d12ad5.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_83d1d10c7ca441f784f9ff2e630e7ed2.pdf?index=trueIn PDF document text
    • http://jelelonu.rf.gd/2d_geometry_worksheets_grade_6.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_107c71b4f8f341359581d662d0a5cd41.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_5c8621248da4464fa4cc7aadddf8188d.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_035591acf9e74c1f971d14c78345e3d8.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_9c4f6874de734f4999a0f4c86c116299.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_7902fa2d44964725b24d26c94411af41.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_67c3a5260571433699d75c56f7ff6ba0.pdf?index=trueIn PDF document text
    • http://lobawapulovad.epizy.com/pojimolar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 5528 bytes
SHA-256: fb1b1fc061327007a09544a04462884f35f4c2bf4a8f915860580bf17cbb9d6e
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 10956 bytes
SHA-256: df796e25218f1bd11a21117bb9fde28b022fe3a15a3194b631e1f5c3c634cff1