Malicious PDF — malware analysis report

Static analysis result for SHA-256 460be50f9da5fd4c…

MALICIOUS

PDF

78.5 KB Created: 2021-04-12 12:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f1c1617cdc5f798e31319dc98fe516ca SHA-1: 1958c13d1cc638ff4e26935fe35029c28a8729d5 SHA-256: 460be50f9da5fd4c05b1a1e2070598e13e8f9c554097f4f30ac58d9a1d40cb58
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 0.9950

Heuristics 6

  • 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.
  • 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://dafemum.ru/strik?utm_term=weekly+homework+sheet+4+3rd+grade+math PDF link annotation
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/13adb6.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/xojixo-sabemagon-padobedosak.pdfIn PDF document text
    • https://tarakemutelomul.weebly.com/uploads/1/3/2/3/132303353/pojaresomavibimezi.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/lufiraguj-pokadamomokaga-virabimasabo.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/borebepizetuwomepafo.pdfIn PDF document text
    • https://nivuvibopaxaji.weebly.com/uploads/1/3/4/5/134588818/b9daa.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/nuxawekanedake-firupiwuz-fodipomididug.pdfIn PDF document text
    • https://zinikigi.weebly.com/uploads/1/3/1/4/131453967/07d6eafb7.pdfIn PDF document text
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/2064664.pdfIn PDF document text
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/3751167.pdfIn PDF document text
    • https://dalujukonuxuda.weebly.com/uploads/1/3/1/1/131163933/3059a.pdfIn PDF document text
    • https://zelewebekosol.weebly.com/uploads/1/3/4/6/134638009/vezosagiladup.pdfIn PDF document text
    • https://witaveju.weebly.com/uploads/1/3/1/4/131452735/474edf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikamax.epizy.com/dujoxutajelemire.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/old_tappan_gas_oven_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066ab3aa-a42b-464d-a75a-fc4dec313bea/52692981792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832ab322-5086-4490-a3e3-8307c0c75d74/oster_belgian_waffle_maker_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/27015877660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd2686c-8065-4b88-b3fc-7341dca53261/walter_benjamin_mechanical_reproduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2795104-0ec3-4eea-83ef-5740a056d0f6/king_lear_act_5_quotes_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/modobi.pdfIn PDF document text
    • http://ridimonaf.rf.gd/free_reading_comprehension_worksheets_halloween.pdfIn PDF document text
    • http://xemozaso.rf.gd/meripawovazazidutobikapos.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/plus_size_formal_wear_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/lowez.pdfIn PDF document text
    • http://fazadag.rf.gd/53039073444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc9eb74-4879-4461-9fec-8bba0a561a5e/63002104543.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_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 5760 bytes
SHA-256: 6cf0788ccbb07895c092d0a7cf70925f1c73ff8e060374e1b58c7a6e495cc4a7
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 11344 bytes
SHA-256: 53eb1037fe1a2f295884a358fe857ca12dfc540ac8036dcf285b3ea0fee47bc1
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61