Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f75b58fdac4a518…

MALICIOUS

PDF

74.0 KB Created: 2021-02-20 05:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34ecf4b5110600503ac0f70411d8b78b SHA-1: 033be8af8a53047a7fe0ed80f8d408d2427f369e SHA-256: 7f75b58fdac4a518eb0610be91b4fc5042e3b83c6f14b66bc96f559396e6db69
156 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 0.9997

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://jottigo.ru/strik?utm_term=pitch+class+theory+prime+form PDF link annotation
    • https://cdn.sqhk.co/vowobupubuze/ieid6ii/ragijiwawut.pdfIn PDF document text
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/cfdbf664bebfd8.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/zxhbijj/fazaki.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/ssxgioR/nexozowa.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/Xhdhjji/28314928652.pdfIn PDF document text
    • http://upgrade4me.com/huey_long_s_share_our_wealth_societyxm3y1.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/yjga4id/92158519580.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/4866650.pdfIn PDF document text
    • https://dunudafulu.weebly.com/uploads/1/3/1/0/131071166/5faab07691a0aef.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/ga39qhd/artificial_intelligence_meaning_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/coghwXY/ziwedubivadogugapom.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/gfhhDgj/zugemirumivesujiwu.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/joterige/pc_wallpaper_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/sidopudazibexizavekoru.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_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 5360 bytes
SHA-256: 6dff683f9d6e1de437ae22152b8f148174c988b9d89ce7d9f8c76ca3ea56aadd
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 11476 bytes
SHA-256: ab1b7fde30342299038c572bba1c79740e3f0f31633e38ddf5ff6e605dfb8e26
font_02_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e

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