Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7cb58b499d1e0f…

MALICIOUS

PDF

79.8 KB Created: 2021-04-25 19:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5b77431d5ca8aa87d7baddb63cc66119 SHA-1: 216eb4d3df88aaf3d6378373b102a65569a6a089 SHA-256: 9a7cb58b499d1e0f0449c315c0198942253745cf6ac877746b3d8e02a261e412
186 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 0.9990

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=how+do+i+apply+for+a+job+at+dunkin+donuts PDF link annotation
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/dosivarekerowobonuge.pdfIn PDF document text
    • http://pexukakadom.22web.org/dewagiri.pdfIn PDF document text
    • https://guwepejesa.weebly.com/uploads/1/3/2/8/132814432/madudolina_welakafig.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/36804985059.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/4069175.pdfIn PDF document text
    • https://daregunomunozo.weebly.com/uploads/1/3/4/7/134723938/najafel-jakuguluseku-dagoribug-neloxumizerexow.pdfIn PDF document text
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/zetojudevuvatonem.pdfIn PDF document text
    • http://luranowebereni.22web.org/elements_of_electrical_and_electronics_engineering_book.pdfIn PDF document text
    • https://lewebivaduxug.weebly.com/uploads/1/3/5/3/135392118/zininowevew.pdfIn PDF document text
    • http://futajef.medianewsonline.com/43295253857.pdfIn PDF document text
    • https://lefoteliwe.weebly.com/uploads/1/3/4/0/134095852/xodok.pdfIn PDF document text
    • https://zofawuzi.weebly.com/uploads/1/3/5/3/135323082/vikoduniforijow-sozixalikesag-duvegokafofe-dexaboxapiduf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/what_does_the_raven_mean_by_nevermore.pdfIn PDF document text
    • http://lesiwemazab.epizy.com/cranial_nerves_anatomy_and_physiology.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/bses_yamuna_new_connection_form.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/buzajufepuwexamitenud.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/responsive_media_queries_css_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4ae399-0993-420f-8c7d-eb1bcc10beb1/78488834677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18e55b9-189b-4ba0-a874-f061140c0995/vakivum.pdfIn PDF document text
    • http://kanusilos.epizy.com/anchored_sheet_pile_retaining_wall.pdfIn PDF document text
    • http://jomedive.epizy.com/83361334626.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/bsc_agriculture_government_colleges_in_karnataka.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/dubbed_anime_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f492fb-e736-4376-ac63-32fbf1ea1637/ludowifulemanigel.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/netbeans_php_windows_10.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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 5472 bytes
SHA-256: 8154c8a94cc6eb224325c11bf0c64115fa4038e8d54b3651218cb0c4c2832414
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 10856 bytes
SHA-256: 75d4b880466d1f12805ddc14aa2aadd7430ec1f2d303a68ea18b60d3116a1ba9