Malicious PDF — malware analysis report

Static analysis result for SHA-256 482f5dab8655ec7c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-29 14:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a314a2067e4158e86238382d89bb98a3 SHA-1: bfcd76d988d3220e29cbce2d0fd76eba2cf26687 SHA-256: 482f5dab8655ec7cd0f7d593a99009fc848cdf7271fba6b897a8ed6d94cea94a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update, a common social engineering tactic to steal credentials or install further malware. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://zajinet.ru/wix?keyword=ubik+pdf+free+download PDF link annotation
    • https://dawosovakix.weebly.com/uploads/1/3/6/0/136097295/fovojit_xetokasa.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/1f804.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/91bb205e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_603f2baacb092.pdfIn PDF document text
    • http://petrol-v-pol-price.site/cannot_access_air_force_portal_from_home83z1e.pdfIn PDF document text
    • https://lepebixetuvenal.weebly.com/uploads/1/3/4/6/134634058/berikavonos_ganibogasegal_puvimuxo_sijifunatateji.pdfIn PDF document text
    • http://ejqy.com/175273739984buem.pdfIn PDF document text
    • https://guzoxufogoxuwo.weebly.com/uploads/1/3/4/0/134097696/lalunijenatip-lapumesagaxa-rekavulad-nonagetarag.pdfIn PDF document text
    • https://kunubixofatefif.weebly.com/uploads/1/3/4/0/134096788/kivegominet.pdfIn PDF document text
    • https://fenorave.weebly.com/uploads/1/3/4/6/134639489/kapedeta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_6021a7d75f14a.pdfIn PDF document text
    • https://werobezukivipa.weebly.com/uploads/1/3/4/3/134337965/e70ede.pdfIn PDF document text
    • https://dawopurasujup.weebly.com/uploads/1/3/0/7/130775219/rupafaxilop-dozezetipoz-xaruvikip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_602c14bdc0c01.pdfIn PDF document text
    • https://gakififevorejep.weebly.com/uploads/1/3/1/8/131872199/naminudutesetad.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/54dbca.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/37239b8522e2759.pdfIn PDF document text
    • http://show-visitor.xyz/madulagapudafusukala2dhnb.pdfIn PDF document text
    • https://safejabev.weebly.com/uploads/1/3/0/7/130739713/853688.pdfIn PDF document text
    • https://kobadibik.weebly.com/uploads/1/3/4/8/134861151/26294811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480174/normal_5ff83267089b3.pdfIn PDF document text
    • https://masagefila.weebly.com/uploads/1/3/4/5/134505888/wopove-gufirukubufux-rujotajer.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/8946528.pdfIn PDF document text
    • http://arthromedshop.xyz/mecanica_vectorial_para_ingenieros_estatica_beer_johnston_10_ediciono3qoc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 5144 bytes
SHA-256: b6ce4ea64637e355cf055fdc00d0466665af2d2f6798f25739c3e3aa215e5873
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 10496 bytes
SHA-256: a43ea4586ed8f7e6822a9dd7a9d10b83d52d35365526e9a2c06362fddde0474c

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