Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fef839f1bf0043…

MALICIOUS

PDF

79.0 KB Created: 2021-02-21 20:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 640383058509724dac5c0a1ac0d390f8 SHA-1: 7a921452f68c81e4e607f24b0f60be051a55aca1 SHA-256: 30fef839f1bf0043089c7c7e150d666827059a1d9c0aef74567186de01a08427
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many of which are hosted on suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URIs points to an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=osi+vs+tcp%252Fip+stack+overflow PDF link annotation
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/sofopik-womejolid-nufamud.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/pidhf2W/60132957112.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/b3hjYWD/mofenawun.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/ajiajfP/titeruror.pdfIn PDF document text
    • http://erogan-encolumbia.site/ap_chem_free_energy_pogil_answer_keysm1p9.pdfIn PDF document text
    • http://lalat.space/7488843934322rmw.pdfIn PDF document text
    • https://cdn.sqhk.co/fujesepulo/5jcc48v/gojekaje.pdfIn PDF document text
    • http://brettlockhart.com/airview_app_free1vcez.pdfIn PDF document text
    • http://drawer.icu/kirimajowis41hcy.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/kukupunopedon/12843437560.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/business_calling_card_format.pdfIn PDF document text
    • http://kamupipoduw.rf.gd/29296485710.pdfIn PDF document text
    • http://runijagaf.rf.gd/dictionary_for_java_240x320.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/kewivases.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/28584313546.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_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 5288 bytes
SHA-256: 5b86697ba6e98aa065cd9baf9eb522b370da29c75405f51f0a29c9b0ccaaaabf
font_01_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 10684 bytes
SHA-256: 8aee980860af034600013084e8d479c6682e9d99cefe7ac0ae865f574ef93e02

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