Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3d55e8db27d3af…

MALICIOUS

PDF

78.2 KB Created: 2021-05-25 18:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c12e109bd485131001d04181bce9228 SHA-1: 7e8cd156c47698123df35582955ddfbc36611420 SHA-256: 6b3d55e8db27d3af6ee558ab613cb0efeb7b243a4b77b5767d1a019f759bf8d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, 'https://jumiwimov.ru/strik?utm_term=interplay+the+process+of+interpersonal+communication+13th+edition+chapter+1', appears to be a lure, potentially leading to a malicious site or further download. No scripts were extracted, but the PDF structure and numerous external links indicate an attempt to redirect the user to malicious content.

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://jumiwimov.ru/strik?utm_term=interplay+the+process+of+interpersonal+communication+13th+edition+chapter+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449419/normal_5ff22a6cad333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_602f3579e68e3.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/sidakatakuzifi_wigidirov.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/puwebewob_xebenil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_6068c24f02486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_601b7b7aa7cf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5ff531ed07b62.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/ca53ae.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/nulifozasakepidijad.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/lesuxetizejagat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_600ff76237497.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/dusined/28292302392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c8bb7e-3a18-4141-b1de-08f2e3f96d8b/57365946293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e4bf9f-539e-4adb-998d-2e92e6921c6e/impressora_hp_color_laserjet_cp1215_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/arrow_down_image.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/fowufevaxelavidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba72cc3-2f70-45a3-ab06-ecdadb2bc744/19387410323.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/los_hermanos_karamazov_resumen_por_partes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3618de4-55ab-447e-9fac-e32f83272d46/areas_de_aplicacion_de_la_psicologia_juridica.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/preliminary_research_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/call_me_by_your_name_movie_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/exercicios_para_aprender_a_tocar_violao.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_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 5648 bytes
SHA-256: 6832a40d90b764f7ea65954ee801e55b822dcff5a10f89c7b61bbfc9c8e33ecc
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10884 bytes
SHA-256: 3a3e388433d8db9c6c20b37ce377cef8c8594ae0f2404230a9f700fa6ca0c734

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