Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33338dc71cb4fdc…

MALICIOUS

PDF

86.2 KB Created: 2021-05-14 22:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53799f755c3fced08bb1664ef2db08f8 SHA-1: 90c190884af322ca311902c3b80d7c30bdd47fc3 SHA-256: a33338dc71cb4fdc9175d3ec15c20fe57cdf46507054d861a6db6dcb91c2a05c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://ponafet.ru/strik?utm_term=samsung+rf4287hars+ice+dispenser+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492897/normal_600dea4d62b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_606443fe3afec.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/caminito_de_la_escuela_letra.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/what_is_mind_control_called.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/dggDTgc/filenix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422367/normal_5ff284103bf57.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/tecnicas_de_redaccion_con_ejemplos.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/dave_and_busters_food_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/9r5jdhg/78314176790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5fe75b95c8675.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/what_is_the_climate_of_the_rainforest_biome.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/rugapara.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/QwhddC0/98149800279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_90fb5d612f394224a864f49b815d1a54.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_f8a9ca8f142c4c5291fc837d25db4864.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_7cb5717bfce04be3a4fcf94f912480af.pdf?index=trueIn PDF document text
    • http://wutejaxevewef.myartsonline.com/descriptive_writing_outline.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_d131b44ed01b4c48a08b3490454483ef.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_190a31a81c37494798a58a5aca55c51b.pdf?index=trueIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/27057950409.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 6292 bytes
SHA-256: f05e2644d716758df2370b43eb8ebb0ca23f3e0feed67ab7f2c8233402da82f0
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 12564 bytes
SHA-256: 7b9427e760d5afe599c8e3db06f86474588af8a5ae716260157e974ec84ff7a8
font_02_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501