Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4f5a24df4ae12d…

MALICIOUS

PDF

79.3 KB Created: 2021-04-03 22:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a343559866d592d1de985f78a5616e1 SHA-1: 7398eb93416a64561c29e37aefe674b2dd44272b SHA-256: 9b4f5a24df4ae12d2828fa2df3c50a7a40dd705d717d0a8f951fdd57aba4ad17
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to direct users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is used to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=vtech+cs6649+instructions
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/90acb0be4d.pdf
    • http://dehydratedoriginalgoodness.com/wilopamezojiwatizavl9.pdf
    • http://cleanup-sale.site/munosarudedererabarojlzjbg.pdf
    • http://akvatehnika74.ru/calendario_escolar_2020_a_2021_sep_tlaxcalap403m.pdf
    • http://berasowugixo.mywebcommunity.org/creation_kit_tutorial.pdf
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/xugirofinapakiriko.pdf
    • http://gidigunorefe.iblogger.org/11949758472.pdf
    • http://dirujadejefogax.iblogger.org/zulanefu.pdf
    • http://talajudoxuxip.mygamesonline.org/complex_sentences_examples.pdf
    • https://tamejozapana.weebly.com/uploads/1/3/2/8/132814544/kuwexazonotakag-jasufetaj-jekirojibofega-bepenigoza.pdf
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/guwipirudapegix.pdf
    • http://bafujowop.22web.org/ronogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_18313b32c5e34f0e9b354ff5a4130717.pdf?index=true
    • http://rupevisa.epizy.com/picsart_photo_editor_for_android.pdf
    • http://timerojulawu.myartsonline.com/wejunagorada.pdf
    • http://newotev.rf.gd/46969263442.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_e8af97960bd642228a52a1792a9efe13.pdf?index=true
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_5b3cbf3b772c43178d6b7c24cd50a921.pdf?index=true
    • http://vevojadiren.epizy.com/carries_war_chapter_2.pdf
    • http://logasizujonasi.rf.gd/microbiological_culture_media.pdf
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_f357946bca794b1aac5b450f295d1000.pdf?index=true
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_85d1c8746efd44ec91fcc379dfc46c0f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefa.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 2900 bytes
font_01_sfnt_off0000f93c.bin
7f5387e08c6048aebb9a3568c02225c68c82e58c1622431626e3b837b0971ed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 5008 bytes
font_02_sfnt_off00010a48.bin
06ec2d564c38e35db62449da63b90943ffb2a75af8fd64dd84ffa36a35297478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10896 bytes

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