Malicious PDF — malware analysis report

Static analysis result for SHA-256 8154ec6e0a913125…

MALICIOUS

PDF

81.0 KB Created: 2021-03-23 20:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e6e3eb12ebc4b1b482710477620e640 SHA-1: db6804d9232f816b277081d87eb17d2e9e1ec080 SHA-256: 8154ec6e0a9131255e2c7926fbcf73c052e374d11a8fffe3c57de5597df7dae2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://kuzutuzo.ru/aws?utm_term=magic+chef+mini+fridge+freezer+stopped+working, appears to be a lure, possibly related to product issues. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://kuzutuzo.ru/aws?utm_term=magic+chef+mini+fridge+freezer+stopped+working
    • http://wowovamofuzo.sportsontheweb.net/oxford_phonics_world_3_student_book.pdf
    • http://mixutadumekaje.mypressonline.com/cgp_an_inspector_calls_revision_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5feb4263e6a6e.pdf
    • https://cdn.sqhk.co/zowonefaso/HUgjhcO/porsgrund_bake_it_easy_fat.pdf
    • http://tebogekememesij.mygamesonline.org/political_map_of_europe_blank.pdf
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5ffec271e929f.pdf
    • https://cdn-cms.f-static.net/uploads/4414336/normal_602ca7dbaa170.pdf
    • https://static.s123-cdn-static.com/uploads/4487399/normal_6007c58706079.pdf
    • https://cdn.sqhk.co/fidegelotag/fOhgRhj/address_label_template_word_free.pdf
    • https://cdn-cms.f-static.net/uploads/4484636/normal_6025d1159f842.pdf
    • http://wasegulom.mygamesonline.org/what_are_the_native_american_symbols.pdf
    • http://bolipoloweda.mygamesonline.org/economy_industry_company_analysis.pdf
    • http://kidupat.getenjoyment.net/malivorerugop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_1533289c9cf546fab9efbd46fc2c4eda.pdf?index=true
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_2142c8697573432b85c46ff556e442db.pdf?index=true
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_9c83b355bf724db99375d3ff4c27ea5b.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_610e89bcded14fe88f61cad3a9c4c8ee.pdf?index=true
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_1ea8b0c6add54fd4843e94866584b6a8.pdf?index=true
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_097906d0858e45ae867fda5fdbb9156a.pdf?index=true
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_cfa49f4ac69c4a37bc1d89381c4a6583.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_0750c42d86d1454cbc6c8c922ae27863.pdf?index=true
    • 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_off0000ff0a.bin
a4f9ea9bf2299a35abf9e1e3f2794aca5de1ac19b13850884e98a81e4d092728		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 5748 bytes
font_01_sfnt_off000112a2.bin
468315d994b33289b62539d8dd09df9d4cca1979134cef12158cf6ca44a4d0ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 10532 bytes

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