Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e50c135aa839a48…

MALICIOUS

PDF

81.8 KB Created: 2021-03-19 13:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5d35fa9b014134654aa7719b197c9dd6 SHA-1: 10af58a96bf5881d4eda66e5a4213e09db5cde52 SHA-256: 4e50c135aa839a48b38d62eade115f6ef0fe3511aac3f879f13c5bb31b9179de
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest malicious intent. The ClamAV detection and ML classifier output further confirm its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=best+3d+printers+cnet PDF link annotation
    • http://tideparipawovu.mygamesonline.org/32305787848.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/1403485.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/sgcvhc7/sigadegebobiragu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabironero/gdgebii/pugozifakewukugekobori.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/N5lgcjg/58409227451.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/60344801442.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • http://sukovuxelex.22web.org/branches_of_philosophy_and_their_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/tSijhfF/13651901723.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/44862950350.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/how_do_i_reset_my_frozen_harmony_remote.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/nelson_mathematics_grade_7.pdfIn PDF document text
    • http://wafenov.iblogger.org/75649940795.pdfIn PDF document text
    • https://pufotesur.weebly.com/uploads/1/3/1/3/131378771/dusur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/alteryx_certification_test_answers.pdfIn PDF document text
    • http://demajipo.rf.gd/brand_identity_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/stihl_chainsaw_sharpening_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/87632214114.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/11_22_63_stephen_king_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/facebook_sdk_android_login.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/myers_briggs_test_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/nojoreputigulesodoze.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/beaver_builder_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/kipit.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_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 5040 bytes
SHA-256: c610a652fde9b7c8aacc52867358ecf1eaab9c17d145776263aade24b3ccf9ca
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 12848 bytes
SHA-256: e0dad7622968c6bf554e09b804877ba82079562c350c561de7636109c2301ca9

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