Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d4a8733a99cd05…

MALICIOUS

PDF

77.2 KB Created: 2021-02-10 17:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55b39baa989703517fa5940ca40437f2 SHA-1: 9095a712ffe8d98356b69cea7ebbe82535cca9d5 SHA-256: 94d4a8733a99cd053534bb33183caf7b6de02be4d4a320139ee370dd52f916b3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • 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.
  • 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://druttle.ru/aws?utm_term=eclipse+neon+for+java+8 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367301/normal_60062aa153eba.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/49cad0b.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/toditumamozanik.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/xinifemewezikuwi.pdfIn PDF document text
    • http://mozujana.22web.org/all_in_one_messenger_for_pc.pdfIn PDF document text
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/ad957ce2b7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcf3fbf03bf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_60204564250ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rinejifivazori.epizy.com/angeles_university_foundation_college_uniform.pdfIn PDF document text
    • http://xiwakutev.epizy.com/math_homework_answers_7th_grade.pdfIn PDF document text
    • http://wiwugaku.epizy.com/47099858533.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/nowepojo.pdfIn PDF document text
    • http://jebanodubefa.rf.gd/98951987039.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/guided_access_ipad_1st_gen.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/xorekexojuvuwoganevo.pdfIn PDF document text
    • http://pidezesu.rf.gd/aasm_narcolepsy_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/77414871544.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/nobuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/32917112045.pdfIn PDF document text
    • http://wotexel.rf.gd/conjugate_acid_base_pairs_chem_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/eos_6d_mark_ii_manual.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 5296 bytes
SHA-256: 3f2a330e8f2b42c5455969416b24da215b4109cc1c598819dba9f6eb8675d22c
font_01_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 10588 bytes
SHA-256: f4e3b557037d843f93532905944ca8bb4dfdcebcfd124dfc4da0fc6718040360
font_02_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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