Malicious PDF — malware analysis report

Static analysis result for SHA-256 398dd4fdc97e0036…

MALICIOUS

PDF

70.0 KB Created: 2021-03-22 06:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dc9496da5bb651e76bc4f658fa2fee6 SHA-1: 7e112b3a759acb860a149bb746ed736ed42e8c2d SHA-256: 398dd4fdc97e00369d19d043186c6eeefbcdedf93766a7ffb6db1c6563094154
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, which is characteristic of SEO link farming or a method to distribute further malicious content. The primary malicious URL identified is http://fukerijinexin.mygamesonline.org/91733337618.pdf, which is part of a mass external link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=don+tyson+school+of+innovation+springdale+arkansas
    • http://fukerijinexin.mygamesonline.org/91733337618.pdf
    • http://zonokiwuwagupu.getenjoyment.net/16131777155.pdf
    • https://cdn.sqhk.co/remavaveso/f5gelYj/24475477266.pdf
    • https://cdn.sqhk.co/pugepavofu/GSighbL/maxpreps_volleyball_rankings.pdf
    • https://cdn.sqhk.co/kofelejezem/idhhwsz/xatisupukejajavomorex.pdf
    • http://vezagoxutejoza.66ghz.com/bupenomadapajigoligoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xafafogaditeki.rf.gd/redshift_linux_manual.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_2e435c13829542bf9b6cfb335d0c4cb4.pdf?index=true
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_9286919eba88483c80103ad73f5bf020.pdf?index=true
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_53178fb170064db793e22e33c5580665.pdf?index=true
    • http://wiwilewito.epizy.com/what_is_the_meaning_of_capitalize_in_accounting.pdf
    • http://dilutibu.onlinewebshop.net/understanding_pathophysiology_free.pdf
    • http://dabemekos.epizy.com/agatha_christie_ten_little_negro.pdf
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_d5563f9807074776a65fe5147607dd49.pdf?index=true
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_29ee76c4cfcf469489ad3ec81e7e6d97.pdf?index=true
    • http://pavolotarape.rf.gd/test_data_management_tools_example.pdf
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_cab3e8af41dc48b881db51132ab3c1e4.pdf?index=true
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_3736762bf75549769407f1746010102d.pdf?index=true
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_466d5012694a4e2aa4d3f852b4c11a0a.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_off0000d431.bin
94a115565eedf8227ef9a97e667d3553ea4df96ed4a20cc7d4cbb9f6cd6dda90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 5640 bytes
font_01_sfnt_off0000e779.bin
278cca35ba24ddc7472df629a9e081194995534f5de7fd97aae3dc0ac4d27947		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 10300 bytes

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