Malicious PDF — malware analysis report

Static analysis result for SHA-256 115c5e85238f2f0b…

MALICIOUS

PDF

83.0 KB Created: 2021-05-07 09:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 938efd9a6071f0965cd7670b2a24aafb SHA-1: 9571baaa9a46f00cdb7ac0d5ab85ba6405c95f7f SHA-256: 115c5e85238f2f0b40be77c9a243fbf5fdb147505b63898de268111fd5ac03dc
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'baby girl names' and the authoring application 'wkhtmltopdf', indicating a lure to potentially malicious content hosted at URLs like 'https://zajinet.ru/strik?utm_term=baby+girl+names+that+start+with+kai' and 'http://retamos.mygamesonline.org/biography_of_narendra_modi_in_english.pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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/strik?utm_term=baby+girl+names+that+start+with+kai
    • http://retamos.mygamesonline.org/biography_of_narendra_modi_in_english.pdf
    • https://cdn-cms.f-static.net/uploads/4365576/normal_6014b012263bd.pdf
    • http://wivevemeb.scienceontheweb.net/cancer_screening_guidelines_chart.pdf
    • http://pasikufopubiwo.mypressonline.com/definicion_de_analisis_de_mercado.pdf
    • https://cdn-cms.f-static.net/uploads/4388293/normal_605f44703e19c.pdf
    • http://bafekovarobuju.iblogger.org/secondary_school_report_card_template.pdf
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fe978284a7f2.pdf
    • http://gopusoduj.mygamesonline.org/kitanuwunenapet.pdf
    • https://cdn-cms.f-static.net/uploads/4453144/normal_606e5b1ad159a.pdf
    • http://vudasuti.mygamesonline.org/convert_to_word_application_free.pdf
    • http://jisuvakuwiraza.medianewsonline.com/jirepaloxoxasogoliji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_80b730c008f1439b819cea13c2e6587e.pdf?index=true
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_a77c4356b3b44604aeaaefd34cc98952.pdf?index=true
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_19a651cc8a6247df9ab7419f34ba47d5.pdf?index=true
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_75d4790c50994970844621bca0dbbda0.pdf?index=true
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_0f07597079a44ef29b872e662af43913.pdf?index=true
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_cbc5e302e1d84947a3a5d4474b268c46.pdf?index=true
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_1d195c66f7bc4626abc4b02b2e2f534f.pdf?index=true
    • http://vimukomexetad.rf.gd/miwuwediweb.pdf
    • http://jubogaju.atwebpages.com/375678519.pdf
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_722187a3fabe4ba3bd743a500268dcc2.pdf?index=true
    • http://levaduru.epizy.com/muworekodenudevi.pdf
    • http://vudexejuvejutek.rf.gd/sitijatetuzigukidopapin.pdf
    • http://pujigiberaxu.epizy.com/56826865254.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_off0001061a.bin
58bf9f82f162d339d40061e4f8a72be5df8d60d7b3a65aa6287d5a135b950dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 5544 bytes
font_01_sfnt_off000118e7.bin
3d1e1741617d0ef65044e9bc4534c1fb53fd234032329120769f80ba6dae6ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 11188 bytes

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